XBRL Financials

Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Mar. 31, 2022	May 25, 2022	Sep. 30, 2021
Document and Entity Information [Abstract]
Entity Registrant Name	AMERCO
Entity Central Index Key	0000004457
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 6,375,692,681
Document Fiscal Year Focus	2022
Document Type	10-K
Document Fiscal Period Focus	FY
Document Period End Date	Mar. 31, 2022
Amendment Flag	false
Entity Common Stock, Shares Outstanding		19,607,788
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity File Number	001-11255
Entity Tax Identification Number	88-0106815
Entity Address Address Line 1	5555 Kietzke Lane
Entity Address Address Line 2	Ste. 100
Entity Address City Or Town	Reno
Entity Address State Or Province	NV
Entity Address Postal Zip Code	89511
City Area Code	775
Local Phone Number	688-6300
Security 12b Title	Common stock, $0.25 par value
Trading Symbol	UHAL
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes
Entity Incorporation State Country Code	NV
Document Annual Report	true
Document Transition Report	false
Auditor Name	BDO USA, LLP
Auditor Location	Phoenix, Arizona
Auditor Firm ID	243

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
ASSETS:
Cash and cash equivalents	$ 2,704,137	$ 1,194,012
Reinsurance recoverables and trade receivables, net	229,343	224,426
Inventories, net	158,888	105,577
Prepaid expenses	236,915	469,144
Investments, fixed maturities and marketable equities	2,893,399	2,695,656
Investments, other	543,755	489,759
Deferred policy acquisition costs, net	103,828	89,749
Other assets	60,409	47,730
Right of use assets, financing, net	620,824	877,038
Right of use assets, operating	74,382	92,505
Related party assets	47,851	35,395
Subtotal assets	7,673,731	6,320,991
Property, plant and equipment, at cost:
Land	1,283,142	1,075,813
Buildings and improvements	5,974,639	5,163,705
Furniture and equipment	846,132	786,505
Property, plant and equipment (gross)	13,358,406	11,413,668
Less: Accumulated depreciation	(3,732,556)	(3,083,053)
Total property, plant and equipment	9,625,850	8,330,615
Total assets	17,299,581	14,651,606
Liabilities:
Accounts payable and accrued expenses	677,785	645,575
Notes, loans and leases payable	6,022,497	4,668,907
Operating lease liabilities	74,197	92,510
Policy benefits and losses, claims and loss expenses payable	978,254	997,701
Liabilities from investment contracts	2,336,238	2,161,530
Other policyholders' funds and liabilities	10,812	12,420
Deferred income	49,157	42,592
Deferred income taxes, net	1,265,358	1,178,489
Total liabilities	11,414,298	9,799,724
Commitments and contingencies (notes 9, 16, 17 and 18)
Stockholders' equity:
Additional paid-in capital	453,819	453,819
Accumulated other comprehensive loss	46,384	106,857
Retained earnings	6,052,233	4,958,359
Total stockholders' equity	5,885,283	4,851,882
Total liabilities and stockholders' equity	17,299,581	14,651,606
Series A Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0	0
Series B Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0	0
Series A Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	0	0
Amerco Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	10,497	10,497
Common Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	(525,653)	(525,653)
Preferred Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	(151,997)	(151,997)
Rental Trailers and Other Rental Equipment [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	615,679	477,921
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	$ 4,638,814	$ 3,909,724

Condensed Consolidated Balance Sheets Parenthetical	Mar. 31, 2022 $ / shares shares
Series Preferred Stock With or Without Par Value Authorized [Member]
Preferred stock:
Preferred stock, shares authorized	50,000,000
Series A Preferred Stock [Member]
Preferred stock:
Preferred stock, shares authorized	6,100,000
Preferred stock, shares issued	6,100,000
Series B Preferred Stock [Member]
Preferred stock:
Preferred stock, shares authorized	100,000
Series Common Stock With or Without Par Value Authorized [Member]
Common stock:
Common stock, shares authorized	250,000,000
Serial Common Stock [Member]
Common stock:
Common stock, shares authorized	10,000,000
Common stock, par or stated value per share \| $ / shares	$ 0.25
Common Stock [Member]
Common stock:
Common stock, shares authorized	250,000,000
Common stock, par or stated value per share \| $ / shares	$ 0.25
Amerco Common Stock [Member]
Common stock:
Common stock, shares authorized	250,000,000
Common stock, shares, issued	41,985,700
Common stock, shares, outstanding	19,607,788
Common stock, par or stated value per share \| $ / shares	$ 0.25
Common Stock in Treasury [Member]
Treasury stock:
Treasury stock, shares	22,377,912
Preferred Stock in Treasury [Member]
Treasury stock:
Treasury stock, shares	6,100,000

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Self-moving equipment rentals	$ 3,958,807	$ 3,083,317	$ 2,692,413
Self-storage revenues	617,120	477,262	418,741
Self-moving and self-storage products and service sales	351,447	344,929	265,091
Property management fees	35,194	31,603	30,406
Life insurance premiums	111,027	121,609	127,976
Property and casualty insurance premiums	86,518	68,779	66,053
Net investment and interest income	148,261	122,938	137,829
Other revenue	431,373	291,548	240,359
Total revenues	5,739,747	4,541,985	3,978,868
Costs and expenses:
Operating expenses	2,676,541	2,187,684	2,117,148
Commission expenses	429,581	329,609	288,332
Cost of sales	259,585	214,059	164,018
Benefits and losses	186,647	179,512	174,836
Amortization of deferred policy acquisition costs	33,854	28,293	31,219
Lease expense	29,910	28,470	26,882
Depreciation, net of (gains) losses on disposals	482,752	609,930	637,063
Net gains on disposal of real estate	(4,120)	3,281	(758)
Total costs and expenses	4,094,750	3,580,838	3,438,740
Earnings from operations	1,644,997	961,147	540,128
Other components of net periodic benefit costs	(1,120)	(987)	(1,054)
Interest expense	(167,424)	(163,502)	(160,950)
Fees and amortization on early extinguishment of debt	(956)	0	0
Pretax earnings	1,475,497	796,658	378,124
Income tax expense	(352,211)	(185,802)	63,924
Earnings available to common shareholders	$ 1,123,286	$ 610,856	$ 442,048
Basic and diluted earnings per common share	$ 57.29	$ 31.15	$ 22.55
Weighted average common shares outstanding: basic and diluted	19,607,788	19,607,788	19,603,708

Condensed Consolidated Statements of Operations Parenthetical - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Depreciation:
Net gains on disposal of personal property	$ (214,203)	$ (54,071)	$ (27,057)
Related party:
Related party revenues, net of eliminations	35,194	31,603	30,406
Related party, costs and expenses, net of eliminations	$ 90,733	$ 71,824	$ 64,697

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Comprehensive income (loss) (pretax):
Net earnings	$ 1,475,497	$ 796,658	$ 378,124
Comprehensive income (loss) (tax effect):
Net earnings	(352,211)	(185,802)	63,924
Comprehensive income (loss) (net of tax):
Net earnings	1,123,286	610,856	442,048
Other comprehensive income (loss):
Foreign currency translation (pretax)	(2,828)	(5,694)	9,377
Foreign currency translation (tax effect)	0	0	0
Foreign currency translation (net of tax)	(2,828)	(5,694)	9,377
Unrealized gain (loss) on investments (pretax)	(78,452)	96,170	124,566
Unrealized gain (loss) on investments (tax effect)	15,826	(19,201)	(26,623)
Unrealized gain (loss) on investments (net of tax)	(62,626)	76,969	97,943
Change in fair value of cash flow hedges (pretax)	605	(569)	(8,352)
Change in fair value of cash flow hedges (tax effect)	(148)	140	2,051
Change in fair value of cash flow hedges (net of tax)	457	(429)	(6,301)
Amounts reclassified into earnings on hedging activities, (pre tax)	3,948	3,640	(3)
Amounts reclassified into earnings on hedging activities (tax effect)	(970)	(894)	1
Amounts reclassified into earnings on hedging,( net of tax)	2,978	2,746	(2)
Postretirement benefit obligation gain (loss) (pretax)	2,049	(1,838)	441
Postretirement benefit obligation gain (loss) (tax effect)	(503)	451	(108)
Postretirement benefit obligation gain (loss) (net of tax)	1,546	(1,387)	333
Total other comprehensive income (loss) (pretax)	(74,678)	91,709	126,029
Total other comprehensive income (loss) (tax effect)	14,205	(19,504)	(24,679)
Total other comprehensive income loss, net	(60,473)	72,205	101,350
Total comprehensive income	1,400,819	888,367	504,153
Total comprehensive income, tax	(338,006)	(205,306)	39,245
Total comprehensive income, net	$ 1,062,813	$ 683,061	$ 543,398

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Less: Treasury Common Stock [Member]	Less: Treasury Preferred Stock [Member]	Less: Unearned Employee Stock Ownership Plan Shares [Member]
Balance at Mar. 31, 2019	$ 3,692,389	$ 10,497	$ 453,326	$ (66,698)	$ 3,976,962	$ (525,653)	$ (151,997)	$ (4,048)
Consolidated statement of change in equity
Increase in market value of released ESOP shares	493	0	493	0	0	0	0	0
Release of unearned ESOP Shares	4,253	0	0	0	0	0	0	4,253
Purchase of ESOP shares	(205)	0	0	0	0	0	0	(205)
Foreign currency translation	9,377	0	0	9,377	0	0	0	0
Unrealized net gain (loss) on investments, net of tax	97,943	0	0	97,943	0	0	0	0
Change in fair value of cash flow hedges, net of tax	(6,301)	0	0	(6,301)	0	0	0	0
Amounts reclassified into earnings on hedging activities	(2)	0	0	(2)	0	0	0	0
Adjustment to postretirement benefit obligation	333	0	0	333	0	0	0	0
Net earnings	442,048	0	0	0	442,048	0	0	0
Common stock dividends	(19,608)	0	0	0	(19,608)	0	0	0
Net activity	528,331	0	493	101,350	422,440	0	0	4,048
Balance at Mar. 31, 2020	4,220,720	10,497	453,819	34,652	4,399,402	(525,653)	(151,997)	0
Consolidated statement of change in equity
Adjustment for adoption of ASU 2016-13	(2,880)	0	0	0	(2,880)	0	0	0
Foreign currency translation	(5,694)	0	0	(5,694)	0	0	0	0
Unrealized net gain (loss) on investments, net of tax	76,969	0	0	76,969	0	0	0	0
Change in fair value of cash flow hedges, net of tax	(429)	0	0	(429)	0	0	0	0
Amounts reclassified into earnings on hedging activities	2,746	0	0	2,746	0	0	0	0
Adjustment to postretirement benefit obligation	(1,387)	0	0	(1,387)	0	0	0	0
Net earnings	610,856	0	0	0	610,856	0	0	0
Common stock dividends	(49,019)	0	0	0	(49,019)	0	0	0
Net activity	631,162	0	0	72,205	558,957	0	0	0
Balance at Mar. 31, 2021	4,851,882	10,497	453,819	106,857	4,958,359	(525,653)	(151,997)	0
Consolidated statement of change in equity
Foreign currency translation	(2,828)	0	0	(2,828)	0	0	0	0
Unrealized net gain (loss) on investments, net of tax	(62,626)	0	0	(62,626)	0	0	0	0
Change in fair value of cash flow hedges, net of tax	457	0	0	457	0	0	0	0
Amounts reclassified into earnings on hedging activities	2,978	0	0	2,978	0	0	0	0
Adjustment to postretirement benefit obligation	1,546	0	0	1,546	0	0	0	0
Net earnings	1,123,286	0	0	0	1,123,286	0	0	0
Common stock dividends	(29,412)	0	0	0	(29,412)	0	0	0
Net activity	1,033,401	0	0	(60,473)	1,093,874	0	0	0
Balance at Mar. 31, 2022	$ 5,885,283	$ 10,497	$ 453,819	$ 46,384	$ 6,052,233	$ (525,653)	$ (151,997)	$ 0

Consolidated Statement of Changes in Stockholders' Equity Parenthetical - $ / shares	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Common Stock, Dividends, Per Share, Declared	$ 1.50	$ 2.50	$ 1.00

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Cash flow from operating activities:
Net earnings	$ 1,123,286	$ 610,856	$ 442,048
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	696,955	664,001	664,120
Amortization of deferred policy acquisition costs	33,854	28,293	31,219
Amortization of premiums and accretion of discounts related to investments, inc	19,749	14,229	13,317
Amortization of debt issuance costs	5,659	5,948	4,426
Interest credited to policyholders	64,692	55,321	51,857
Change in allowance for losses on trade receivables	4,227	1,206	(14)
Change in allowance for inventory reserves	15,235	1,298	640
Net gains on disposal of personal property	(214,203)	(54,071)	(27,057)
Net gains on disposal of real estate	(4,120)	3,281	(758)
Net gains on sales of investments	(11,872)	(10,058)	(13,596)
Net (gains) losses on equity investments	(7,837)	(394)	(3,783)
Deferred income taxes	101,091	68,411	317,893
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(9,187)	(39,516)	38,129
Inventories and parts	(68,536)	(5,775)	1,776
Prepaid expenses	232,342	94,359	(391,120)
Capitalization of deferred policy acquisition costs	(32,626)	(36,162)	(24,447)
Other assets	(2,706)	29,865	(1,295)
Related party assets	(10,357)	(487)	(5,645)
Accounts payable and accrued expenses	28,752	92,925	(4,530)
Policy benefits and losses, claims and loss expenses payable	(19,692)	(1,992)	(12,618)
Other policyholders' funds and liabilities	(1,608)	2,230	(4,857)
Deferred income	5,216	11,567	(1,818)
Related party liabilities	(2,079)	60	1,626
Net cash provided by operating activities	1,946,235	1,535,395	1,075,513
Cash flow from investing activities:
Escrow deposits	(9,328)	(5,221)	6,617
Purchase of:
Property, plant and equipment	(2,136,537)	(1,441,475)	(2,309,406)
Short term investments	(74,418)	(69,929)	(61,226)
Fixed maturities investments	(627,326)	(606,233)	(379,349)
Equity securities	(19,299)	(962)	(83)
Preferred stock	(8,000)	(16,144)	0
Real estate	(261)	(622)	(4,286)
Mortgage loans	(158,147)	(158,071)	(62,016)
Proceeds from sale and paydowns of:
Property, plant and equipment	623,235	537,484	687,375
Short term investments	51,591	69,718	59,056
Fixed maturities investments	360,937	529,239	268,636
Equity securities	2,046	207	185
Preferred stock	2,000	2,700	2,375
Real estate	113	255	311
Mortgage loans	126,218	29,525	25,162
Net cash used by investing activities	(1,867,176)	(1,129,529)	(1,766,649)
Cash flow from financing activities:
Borrowings from credit facilities	1,969,474	922,008	1,121,412
Principal repayments on credit facilities	(437,506)	(662,588)	(349,986)
Debt issuance costs	(13,156)	(5,793)	(5,332)
Capital lease payments	(166,262)	(221,247)	(307,782)
Employee stock ownership plan value	0	0	(206)
Common stock dividends paid	(29,412)	(49,019)	(29,404)
Investment contract deposits	347,520	517,856	234,640
Investment contract withdrawals	(237,503)	(213,864)	(151,022)
Net cash provided by financing activities	1,433,155	287,353	512,320
Effects of exchange rate on cash	(2,089)	6,441	(533)
Increase (decrease) cash and cash equivalents	1,510,125	699,660	(179,349)
Cash and cash equivalents at the beginning of period	1,194,012	494,352	673,701
Cash and cash equivalents at the end of the period	$ 2,704,137	$ 1,194,012	$ 494,352

Basis of Presentation	12 Months Ended
Basis of Presentation	Mar. 31, 2022
Disclosure Text Block [Abstract]
Basis of Presentation	Note 1. Basis of Presentation AMERCO, a Nevada Corporation (“AMERCO”), has a fiscal year that ends on the 31 st of March for each year that is referenced. Our insurance company subsidiaries have fiscal years that end on the 31 st of December for each year that is referenced. They have been consolidated on that basis. Our insurance companies’ financial reporting processes conform to calendar year reporting as required by state insurance departments. Management believes that consolidating their calendar year into our fiscal year financial statements does not materially affect the financial position or results of operations. We disclose material events, if any, occurring during the intervening period. Consequently, all references to our insurance subsidiaries’ years 2021, 2020 and 2019 correspond to fiscal 2022, 2021 and 2020 for AMERCO. Accounts denominated in non-U.S. currencies have been translated into U.S. dollars. Certain amounts reported in previous years have been reclassified to conform to the current presentation. Please see Note 3, Accounting Policies – Adoption of New Accounting Pronouncements , of the Notes to Consolidated Financial Statements.

Principles of Consolidation	12 Months Ended
Principles of Consolidation	Mar. 31, 2022
Disclosure Text Block [Abstract]
Principles of Consolidation	Note 2. Principles of Consolidation We apply Accounting Standards Codification (“ASC”) 810 - Consolidation (“ASC 810”) in our principles of consolidation. ASC 810 addresses arrangements where a company does not hold a majority of the voting or similar interests of a variable interest entity (“VIE”). A company is required to consolidate a VIE if it has determined it is the primary beneficiary, which is the entity with the power to direct activities that most significantly affect the economic performance of the VIE and has the obligation absorbs the majority of the losses or benefits. ASC 810 also addresses the policy when a company owns a majority of the voting or similar rights and exercises effective control. A VIE is not self-supportive due to having one or both of the following conditions: (i) it has an insufficient amount of equity for it to finance its activities without receiving additional subordinated financial support or (ii) its owners do not hold the typical risks and rights of equity owners. This determination is made upon the creation of a variable interest and is re-assessed on an on-going basis should certain changes in the operations of a VIE, or its relationship with the primary beneficiary trigger a reconsideration. After a reconsideration event occurs the most recent facts and circumstances are utilized in determining whether or not a company is a VIE, which other company(ies) have a variable interest in the entity, and whether or not the company’s interest is such that it is the primary beneficiary. We will continue to monitor our relationships with the other entities regarding who is the primary beneficiary, which could change based on facts and circumstances of any reconsideration events. Please see Note 19, Related Party Transactions, of the Notes to Consolidated Financial Statements. The accompanying Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries, which are consolidated under the voting interest model. Intercompany accounts and transactions have been eliminated. Description of Legal Entities AMERCO is the holding company for: U-Haul International, Inc. (“U-Haul”); Amerco Real Estate Company (“Real Estate”); Repwest Insurance Company (“Repwest”); and Oxford Life Insurance Company (“Oxford”). Unless the context otherwise requires, the terms “Company,” “we,” “us” or “our” refer to AMERCO and all of its legal subsidiaries. Description of Operating Segments AMERCO has three ( 3 ) reportable segments. They are Moving and Storage, Property and Casualty Insurance and Life Insurance. Moving and Storage includes AMERCO, U-Haul, and Real Estate and the wholly-owned subsidiaries of U-Haul and Real Estate. Operations consist of the rental of trucks and trailers, sales of moving supplies, sales of towing accessories, sales of propane, and the rental of fixed and portable moving and storage units to the “do-it-yourself” mover and management of self-storage properties owned by others. Operations are conducted under the registered trade name U-Haul ® throughout the United States and Canada. Property and Casualty Insurance includes Repwest and its wholly-owned subsidiaries and ARCOA Risk Retention Group (“ARCOA”). Property and Casualty Insurance provides loss adjusting and claims handling for U-Haul through regional offices in the United States and Canada. Property and Casualty Insurance also underwrites components of the Safemove ® , Safetow ® , Safemove Plus ® , Safestor ® and Safestor Mobile ® protection packages to U-Haul customers. The business plan for Property and Casualty Insurance includes offering property and casualty products in other U-Haul related programs. ARCOA is a group captive insurer owned by us and our wholly owned subsidiaries whose purpose is to provide insurance products related to our moving and storage business. Life Insurance includes Oxford and its wholly owned subsidiaries. Life Insurance provides life and health insurance products primarily to the senior market through the direct writing and reinsuring of life insurance, Medicare supplement and annuity policies.

Reinsurance Recoverables and Trade Receivables, Net	12 Months Ended
Reinsurance Recoverables and Trade Receivables, Net	Mar. 31, 2022
Reinsurance Disclosures [Abstract]
Reinsurance Recoverables and Trade Receivables, Net	Note 4. Reinsurance Recoverables and Trade Receivables, Net Reinsurance recoverables and trade receivables, net were as follows: March 31, 2022 2021 (In thousands) Reinsurance recoverable $ 50,586 $ 66,386 Trade accounts receivable 150,285 121,251 Paid losses recoverable 345 276 Accrued investment income 28,689 27,883 Premiums and agents' balances 1,650 2,546 Independent dealer receivable 73 258 Other receivables 6,364 10,247 237,992 228,847 Less: Allowance for credit losses (8,649) (4,421) $ 229,343 $ 224,426

Investments	12 Months Ended
Investments	Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Investments	Note 5. Investments Expected maturities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. We deposit bonds with insurance regulatory authorities to meet statutory requirements. The adjusted cost of bonds on deposit with insurance regulatory authorities was $ 27.1 million and $ 27.7 million for December 31, 2021 and 2020, respectively. Available-for-Sale Investments Available-for-sale investments as of March 31, 2022 were as follows: Cost Amortized Unrealized Gains Gross Unrealized Losses More than 12 Months Gross Unrealized Losses Less than 12 Months Gross Allowance for Expected Credit Losses Value Fair (In thousands) U.S. treasury securities and government obligations $ 128,078 $ 7,984 $ – $ (969) $ – $ 135,093 U.S. government agency mortgage-backed securities 44,678 280 (42) (3,111) – 41,805 Obligations of states and political subdivisions 178,040 15,450 – (508) – 192,982 Corporate securities 1,989,212 138,909 (402) (6,604) (60) 2,121,055 Mortgage-backed securities 324,029 7,671 (1) (1,542) – 330,157 $ 2,664,037 $ 170,294 $ ( 445 ) $ ( 12,734 ) $ ( 60 ) $ 2,821,092 Available-for-sale investments as of March 31, 2021 were as follows: Cost Amortized Unrealized Gains Gross Unrealized Losses More than 12 Months Gross Unrealized Losses Less than 12 Months Gross Allowance for Expected Credit Losses Value Fair (in thousands) U.S. treasury securities and government obligations $ 92,429 $ 12,941 $ – $ – $ – $ 105,370 U.S. government agency mortgage-backed securities 61,427 911 (1) (132) – 62,205 Obligations of states and political subdivisions 230,521 25,249 (59) (3) – 255,708 Corporate securities 1,846,507 199,447 (163) (640) (1,320) 2,043,831 Mortgage-backed securities 174,728 11,706 (1) (8) – 186,425 $ 2,405,612 $ 250,254 $ ( 224 ) $ ( 783 ) $ ( 1,320 ) $ 2,653,539 We sold available-for-sale securities with a fair value of $ 352.3 million, $ 523.9 million and $ 264.5 million in fiscal 2022, 2021 and 2020, respectively. The gross realized gains on these sales totaled $ 9.5 million, $ 9.6 million and $ 6.4 million in fiscal 2022, 2021 and 2020, respectively. We realized gross losses on these sales of $ 1.4 million, $ 2.1 million and $ 0.2 million in fiscal 2022, 2021 and 2020, respectively. We adopted Topic 326 as of April 1, 2020. For available-for-sale debt securities in an unrealized loss position, we first assess whether the security is below investment grade. For securities that are below investment grade, we evaluate whether the decline in fair value has resulted from credit losses or other factors such as the interest rate environment. Declines in value due to credit are recognized as an allowance. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse market conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, cumulative default rates based on ratings are used to determine the potential cost of default, by year. The present value of these potential costs is then compared to the amortized cost of the security to determine the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Declines in fair value that have not been recorded through an allowance for credit losses, such as declines due to changes in market interest rates, are recorded through accumulated other comprehensive income, net of applicable taxes. If we intend to sell a security, or it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis, the security is written down to its fair value and the write down is charged against the allowance for credit losses, with any incremental impairment reported in earnings. Reversals of the allowance for credit losses are permitted and should not exceed the allowance amount initially recognized. Changes in the allowance for credit losses are recorded as provision for (or reversal of) credit loss expense. There were no incremental impairment charges recorded during fiscal year 2022. The adjusted cost and estimated market value of available-for-sale investments by contractual maturity, were as follows: March 31, 2022 March 31, 2021 Cost Amortized Value Fair Cost Amortized Value Fair (In thousands) Due in one year or less $ 97,969 $ 99,432 $ 90,142 $ 91,190 Due after one year through five years 541,840 570,135 562,442 601,818 Due after five years through ten years 704,295 765,073 672,733 754,536 Due after ten years 995,904 1,056,295 905,567 1,019,570 2,340,008 2,490,935 2,230,884 2,467,114 Mortgage backed securities 324,029 330,157 174,728 186,425 $ 2,664,037 $ 2,821,092 $ 2,405,612 $ 2,653,539 Equity investments of common stock and non-redeemable preferred stock were as follows: March 31, 2022 March 31, 2021 Cost Amortized Value Fair Cost Amortized Value Fair (In thousands) Common stocks $ 27,674 $ 46,212 $ 9,775 $ 20,440 Non-redeemable preferred stocks 26,054 26,095 20,034 21,677 $ 53,728 $ 72,307 $ 29,809 $ 42,117 Investments, other The carrying value of other investments was as follows: March 31, 2022 2021 (In thousands) Mortgage loans, net $ 423,163 $ 391,230 Short-term investments 30,916 7,234 Real estate 67,824 68,813 Policy loans 10,309 11,163 Other equity investments 11,543 11,319 $ 543,755 $ 489,759 Mortgage loans are carried at the unpaid balance, less an allowance for expected losses net of any unamortized premium or discount. The portfolio of mortgage loans is principally collateralized by self-storage facilities and commercial properties. The interest rate range on the mortgage loans is 3.5 % to 5.9 % with maturities between 2022 and 2036 . The allowance for expected losses was $ 0.5 million for both March 31, 2022 and 2021. These loans represent first lien mortgages held by us. Mortgage loans are reviewed on an ongoing basis and analysis may include market analysis, estimated valuations of the underlying collateral, loan to value ratios, tenant creditworthiness and other factors. For our mortgage loans, no specifically identified loans were impaired as of March 31, 2022. We have not experienced any material losses related to the notes from individual or groups of notes in any particular industry or geographic area. Short-term investments consist primarily of investments in money market funds, mutual funds and any other investments with short-term characteristics that have original maturities of less than one year at acquisition. These investments are recorded at cost, which approximates fair value. Real estate held for future development or use is carried at the lower of fair value at time of acquisition or current estimated fair value less cost to sell. Other equity investments are carried at cost and assessed for impairment. Insurance policy loans are carried at their unpaid balance.

Other Assets	12 Months Ended
Other Assets	Mar. 31, 2022
Disclosure Text Block [Abstract]
Other Assets	Note 6. Other Assets Other assets were as follows: March 31, 2022 2021 (In thousands) Deposits (debt-related) $ 37,588 $ 33,952 Cash surrender value of life insurance policies – 567 Deposits (real estate related) 22,821 13,211 $ 60,409 $ 47,730

Net Investment and Interest Income	12 Months Ended
Net Investment and Interest Income	Mar. 31, 2022
Disclosure Text Block [Abstract]
Net Investment and Interest Income	Note 7. Net Investment and Interest Income Net investment and interest income, were as follows: Years Ended March 31, 2022 2021 2020 (In thousands) Fixed maturities $ 111,625 $ 102,021 $ 107,434 Real estate 5,648 5,769 7,304 Insurance policy loans 705 829 974 Mortgage loans 25,850 18,248 17,164 Short-term, amounts held by ceding reinsurers, net and other investments 11,713 3,103 9,807 Investment income 155,541 129,970 142,683 Less: investment expenses (7,280) (7,032) (4,854) Net investment and interest income $ 148,261 $ 122,938 $ 137,829

Borrowings	12 Months Ended
Borrowings	Mar. 31, 2022
Debt Disclosure [Abstract]
Borrowings	Note 8. Borrowings Long-Term Debt Long-term debt was as follows: March 31, 2022 Rates Maturities 2022 2021 (In thousands) Real estate loan (amortizing term) 1.83 % 2023 $ 50,259 $ 82,913 Senior mortgages 2.70 % - 5.50 % 2023 - 2042 2,206,268 2,125,324 Real estate loans (revolving credit) (a) 1.58 % - 3.14 % 2023 - 2025 535,000 535,000 Fleet loans (amortizing term) 1.61 % - 4.66 % 2022 - 2028 124,651 176,295 Fleet loans (revolving credit) 1.30 % - 2.36 % 2024 - 2026 560,000 535,000 Finance leases (rental equipment) 2.16 % - 5.04 % 2022 - 2026 347,393 513,623 Finance liability (rental equipment) 1.60 % - 4.68 % 2024 - 2030 949,936 644,375 Private placements 2.43 % - 2.88 % 2029 - 2035 1,200,000 – Other obligations 1.50 % - 8.00 % 2022 - 2049 86,206 86,085 Notes, loans and finance leases payable $ 6,059,713 $ 4,698,615 Less: Debt issuance costs (37,216) (29,708) Total notes, loans and finance leases payable, net $ 6,022,497 $ 4,668,907 (a) Certain loans have interest rate swaps fixing the rate between 3.03% and 3.14% based on current margin Real Estate Backed Loans Real Estate Loan Real Estate and certain of its subsidiaries and U-Haul Company of Florida are borrowers under a real estate loan (the “Real Estate Loan”). The Real Estate Loan requires monthly principal and interest payments, with the unpaid loan balance and accrued and unpaid interest due at maturity. The Real Estate Loan is secured by various properties owned by the borrowers. The interest rate, per the provisions of the amended loan agreement, is the applicable LIBOR plus the applicable margin. As of March 31, 2022, the applicable LIBOR was 0.33 % and the applicable margin was 1.50 %, the sum of which was 1.83 %. The default provisions of the Real Estate Loan include non-payment of principal or interest and other standard reporting and change-in-control covenants. There are limited restrictions regarding our use of the funds. Senior Mortgages Various subsidiaries of Real Estate and U-Haul are borrowers under certain senior mortgages. The senior mortgages require monthly principal and interest payments. The senior mortgages are secured by certain properties owned by the borrowers. The fixed interest rates, per the provisions of the senior mortgages, range between 2.70% and 5.50%. The weighted average interest rate of these loans as of March 31, 2022 was 4.0%. Certain senior mortgages have an anticipated repayment date and a maturity date. If these senior mortgages are not repaid by the anticipated repayment date, the interest rate on these mortgages would increase from the current fixed rate. We are using the anticipated repayment date for our maturity schedule. Real Estate and U-Haul have provided limited guarantees of the senior mortgages. The default provisions of the senior mortgages include non-payment of principal or interest and other standard reporting and change-in-control covenants. There are limited restrictions regarding our use of the funds. Real Estate Loans (Revolving Credit) Various subsidiaries of Real Estate are borrowers under asset-backed real estate loans with an aggregate borrowing capacity of $ 385.0 million. As of March 31, 2022, the outstanding balance of these loans in the aggregate was $ 385.0 million. These loans are secured by certain properties owned by the borrowers. The loan agreements provide for term loans, subject to the terms of the loan agreements. The loans require monthly interest payments with the unpaid loan balance and accrued and unpaid interest due at maturity. The interest rate, per the provision of the loan agreements, is the applicable LIBOR plus the applicable margin. As of March 31, 2022, the applicable LIBOR was between 0.21 % and 0.45 % and the margin was between 1.25 % and 1.50 %, the sum of which was between 1.46 % and 1.85 %. AMERCO is the guarantor of these loans. The default provisions of the loan include non-payment of principal or interest and other standard reporting and change-in-control covenants. These loan agreements contain fallback language for the replacement of LIBOR. AMERCO is a borrower under a real estate loan. The current maximum credit commitment is $ 200.0 million, which can be increased to $ 300.0 million by bringing in other lenders. As of March 31, 2022, the outstanding balance was $ 150.0 million. This loan agreement provides for revolving loans, subject to the terms of the loan agreement. This loan requires monthly interest payments with the unpaid loan balance and accrued and unpaid interest due at maturity. As of March 31, 2022, the applicable LIBOR was 0.21 % and the margin was 1.38 %, the sum of which was 1.59 %. The default provisions of the loan include non-payment of principal or interest and other standard reporting and change-in-control covenants. There is a 0.30 % fee charged for unused capacity. This loan agreement contains fallback language for the replacement of LIBOR. Fleet Loans Rental Truck Amortizing Loans The amortizing loans require monthly principal and interest payments, with the unpaid loan balance and accrued and unpaid interest due at maturity. These loans were used to purchase new trucks. The interest rates, per the provision of the loan agreements, are carried at fixed rates ranging between 1.61 % and 4.66 %. All of our rental truck amortizing loans are collateralized by the rental equipment purchased. The majority of these loans are funded at 70%, but some may be funded at 100%. AMERCO, and in some cases U-Haul, is guarantor of these loans. The default provisions of these loans include non-payment of principal or interest and other standard reporting and change-in-control covenants. Rental Truck Revolvers Various subsidiaries of U-Haul entered into three revolving fleet loans with an aggregate borrowing capacity of $ 590.0 million. The outstanding balance for these revolvers is $ 560.0 million. The interest rates, per the provision of the loan agreements, in aggregate of $ 385.0 million, are the applicable LIBOR plus the applicable margin. As of March 31, 2022, the applicable LIBOR was 0.21 % and the margin was between 1.15 % and 1.25 %, the sum of which was between 1.36 % and 1.46 %. Of this $385.0 million outstanding, $ 100.0 million was fixed with an interest rate of 2.36 %. The other loan of $175.0 million uses the Secured Overnight Funding Rate which interest rate was 0.05% plus a margin of 1.25% totaling 1.30% as of March 31, 2022. Only interest is paid on the loans until the last nine months of the respective loan terms when principal becomes due monthly. These loan agreements either contain fallback language for the replacement of LIBOR or are in the process of being amended to add updated language. Finance Leases The Finance Lease balance represents our sale-leaseback transactions of rental equipment. The agreements are generally seven (7) year terms with interest rates ranging from 2.16% to 5.04%. All of our finance leases are collateralized by our rental fleet. The net book value of the corresponding rental equipment was $620.8 million and $877.0 million as of March 31, 2022 and March 31, 2021, respectively. There were no new financing leases, as assessed under the new leasing guidance, entered into during fiscal 2022. Finance Liabilities Finance liabilities represent our rental equipment financing transactions, and we assess if sale-leaseback transactions qualify as a sale at initiation by determining if a transfer of ownership occurs. We have determined that our equipment sale-leasebacks do not qualify as a sale, as the buyer-lessors do not obtain control of the assets in our ongoing sale-leaseback arrangements. As a result, sale-leasebacks are accounted for as a financial liability and the leased assets are capitalized at cost. Our finance liabilities have an average term of seven (7) years and interest rates ranging from 1.60 % to 4.68 %. These finance liabilities are collateralized by our rental fleet. The net book value of the corresponding rental equipment was $ 1,068.3 million and $ 718.3 million as of March 31, 2022 and March 31, 2021, respectively Private Placements In September 2021, AMERCO entered into a note purchase agreement to issue $ 600.0 million of fixed rate senior unsecured notes in a private placement offering. These notes consist of four tranches each totaling $ 150.0 million and funded in September 2021. The fixed interest rates range between 2.43 % and 2.78 % with maturities between 2029 and 2033 . Interest is payable semiannually. In December 2021, AMERCO entered into a note purchase agreement to issue $ 600.0 million of fixed rate senior unsecured notes in a private placement offering. These notes funded in January 2022. These notes consist of three tranches each totaling $ 100.0 million and two tranches each totaling $ 150.0 million. The fixed interest rates range between 2.55 % and 2.88 % with maturities between 2030 and 2035 . Interest is payable semiannually. Other Obligations In February 2011, AMERCO and U.S. Bank, NA (the “Trustee”) entered into the U-Haul Investors Club ® Indenture. AMERCO and the Trustee entered into this indenture to provide for the issuance of notes by us directly to investors over our proprietary website, uhaulinvestorsclub.com (“U-Notes ® ”). The U-Notes ® are secured by various types of collateral, including, but not limited to, rental equipment and real estate. U-Notes ® are issued in smaller series that vary as to principal amount, interest rate and maturity. U-Notes ® are obligations of the Company and secured by the associated collateral; they are not guaranteed by any of the Company’s affiliates or subsidiaries. As of March 31, 2022, the aggregate outstanding principal balance of the U-Notes ® issued was $ 88.5 million, of which $ 2.3 million is held by our insurance subsidiaries and eliminated in consolidation. Interest rates range between 1.50 % and 8.00 % and maturity dates range between 2022 and 2049 . Oxford is a member of the Federal Home Loan Bank (“FHLB”) and, as such, the FHLB has made deposits with Oxford. As of December 31, 2021, the deposits had an aggregate balance of $ 60.0 million, for which Oxford pays fixed interest rates between 0.49 % and 1.72 % with maturities between September 30, 2022 and September 29, 2025. As of December 31, 2021, available-for-sale investments held with the FHLB totaled $ 105.6 million, of which $ 62.8 million were pledged as collateral to secure the outstanding advances. The balances of these advances are included within Liabilities from investment contracts on the consolidated balance sheets. Annual Maturities of Notes, Loans and Finance Leases Payable The annual maturities of our notes, loans and finance leases payable as of March 31, 2022 for the next five years and thereafter are as follows: Years Ended March 31, 2023 2024 2025 2026 2027 Thereafter Total (In thousands) Notes, loans and finance leases payable, secured $ 478,954 $ 937,542 $ 898,740 $ 570,127 $ 559,961 $ 2,614,389 $ 6,059,713

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (SX 210.4-08(c))
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Interest on Borrowings	12 Months Ended
Interest on Borrowings	Mar. 31, 2022
Interest Expense, Borrowings [Abstract]
Interest on Borrowings	Note 9. Interest on Borrowings Interest Expense Components of interest expense include the following: Years Ended March 31, 2022 2021 2020 (In thousands) Interest expense $ 167,618 $ 165,484 $ 180,444 Capitalized interest (9,700) (11,573) (23,517) Amortization of transaction costs 5,556 5,949 4,427 Interest expense resulting from cash flow hedges 3,950 3,642 (404) Total interest expense 167,424 163,502 160,950 Interest paid in cash, including payments related to derivative contracts, amounted to $ 147.9 million, $ 153.2 million and $ 168.1 million for fiscal 2022, 2021 and 2020, respectively. Interest Rates Interest rates and our revolving credit borrowings were as follows: Revolving Credit Activity Years Ended March 31, 2022 2021 2020 (In thousands, except interest rates) Weighted average interest rate during the year 1.40 % 1.40 % 3.31 % Interest rate at year end 1.49 % 1.40 % 2.86 % Maximum amount outstanding during the year $ 1,105,000 $ 1,175,000 $ 1,086,000 Average amount outstanding during the year $ 1,085,074 $ 1,088,293 $ 1,002,081 Facility fees $ 253 $ 261 $ 193

Derivatives	12 Months Ended
Derivatives	Mar. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Note 10. Derivatives We manage exposure to changes in market interest rates. Our use of derivative instruments is limited to highly effective interest rate swaps to hedge the risk of changes in cash flows (future interest payments) attributable to changes in LIBOR swap rates, with the designated benchmark interest rate being hedged on certain of our LIBOR indexed variable rate debt and a variable rate operating lease. The interest rate swaps effectively fix our interest payments on certain LIBOR indexed variable rate debt. We monitor our positions and the credit ratings of its counterparties and do not currently anticipate non-performance by the counterparties. Interest rate swap agreements are not entered into for trading purposes. These fair values are determined using pricing valuation models which include broker quotes for which significant inputs are observable. They include adjustments for counterparty credit quality and other deal-specific factors, where appropriate and are classified as Level 2 in the fair value hierarchy. The derivative fair values reflected in prepaid expense and accounts payable and accrued expenses in the consolidated balance sheet were as follows: March 31, 2022 March 31, 2021 (In thousands) Interest rate contracts designated as hedging instruments Assets $ – $ – Liabilities 587 5,141 Notional amount (debt) 235,000 235,000 The Effect of Interest Rate Contracts on the Statements of Operations Years Ended March 31, 2022 2021 2020 (In thousands) (Gain) loss recognized in AOCI on interest rate contracts $ (4,553) $ (3,071) $ 8,355 (Gain) loss reclassified from AOCI into income $ ( 3,948 ) $ ( 3,640 ) $ 3 Gains or losses recognized in income on derivatives are recorded as interest expense in the consolidated statements of operations. During fiscal year 2022, we recognized an increase in the fair value of our cash flow hedges of $0.5 million, net of taxes. During fiscal year 2022, we reclassified $ 3.9 million from accumulated other comprehensive income (loss) (“AOCI”) to interest expense. As of March, 31 2022, we expect to reclassify $ 1.2 million of net gains on interest contracts from AOCI to earnings as interest expense over the next twelve months. We use derivatives to hedge our equity market exposure to indexed annuity products sold by our Life Insurance company. These contracts earn a return for the contractholder based on the change in the value of the S&P 500 index between annual index point dates. We buy and sell listed equity and index call options and call option spreads. The credit risk is with the party in which the options are written. The net option price is paid up front and there are no additional cash requirements or additional contingent liabilities. These contracts are held at fair value on our balance sheet. At December 31, 2021 and 2020, these derivative hedges had a fair value of $ 7.5 million and $ 6.6 million, with notional amounts of $ 416.7 million and $ 282.7 million, respectively. These derivative instruments are included in Investments, other; on the consolidated balance sheets. The fair values of these call options are determined based on quoted market prices from the relevant exchange and are classified as Level 1 in the fair value hierarchy. Although the call options are employed to be effective hedges against our policyholder obligations from an economic standpoint, they do not meet the requirements for hedge accounting under GAAP. Accordingly, the changes in fair value of the call options are recognized each reporting date as a component of net investment and interest income. The change in fair value of the call options include the gains or losses recognized at the expiration of the option term and the changes in fair value for open contracts.

Accumulated Other Comprehensive Income	12 Months Ended
Accumulated Other Comprehensive Income	Mar. 31, 2022
Disclosure Text Block [Abstract]
Other Comprehensive Income Noncontrolling Interest [Text Block]	Note 11. Accumulated Other Comprehensive Income (Loss) A summary of our AOCI components, net of tax, were as follows: Foreign Currency Translation Unrealized Net Gain on Investments Fair Value of Cash Flow Hedges Postretirement Benefit Obligation Net Loss Accumulated Other Comprehensive Income (Loss) (In thousands) Balance as of March 31, 2019 $ (56,612) $ (7,259) $ 107 $ (2,934) $ (66,698) Foreign currency translation 9,377 – – – 9,377 Unrealized net gain on investments – 97,943 – – 97,943 Change in fair value of cash flow hedges – – (6,301) – (6,301) Amounts reclassified into earnings on hedging activities – – (2) – (2) Change in post retirement benefit obligations – – – 333 333 Other comprehensive income (loss) 9,377 97,943 (6,303) 333 101,350 Balance as of March 31, 2020 $ (47,235) $ 90,684 $ (6,196) $ (2,601) $ 34,652 Foreign currency translation (5,694) – – – (5,694) Unrealized net gain on investments – 76,969 – – 76,969 Change in fair value of cash flow hedges – – (429) – (429) Amounts reclassified into earnings on hedging activities – – 2,746 – 2,746 Change in post retirement benefit obligations – – – (1,387) (1,387) Other comprehensive income (loss) (5,694) 76,969 2,317 (1,387) 72,205 Balance as of March 31, 2021 $ (52,929) $ 167,653 $ (3,879) $ (3,988) $ 106,857 Foreign currency translation (2,828) – – – (2,828) Unrealized net loss on investments – (62,626) – – (62,626) Change in fair value of cash flow hedges – – 457 – 457 Amounts reclassified into earnings on hedging activities – – 2,978 – 2,978 Change in post retirement benefit obligations – – – 1,546 1,546 Other comprehensive income (loss) (2,828) (62,626) 3,435 1,546 (60,473) Balance as of March 31, 2022 $ ( 55,757 ) $ 105,027 $ ( 444 ) $ ( 2,442 ) $ 46,384

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Mar. 31, 2022
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity	Note 12. Stockholders’ Equity The following table lists the dividends that have been declared and issued for fiscal years 2022 and 2021. Common Stock Dividends Declared Date Per Share Amount Record Date Dividend Date October 6, 2021 $ 0.50 October 18, 2021 October 29, 2021 August 19, 2021 $ 0.50 September 7, 2021 September 21, 2021 June 9, 2021 $ 0.50 June 24, 2021 July 8, 2021 December 9, 2020 $ 2.00 December 21, 2020 December 30, 2020 August 20, 2020 $ 0.50 September 7, 2020 September 21, 2020 As of March 31, 2022, no awards had been issued under the 2016 AMERCO Stock Option Plan.

Provision for Taxes	12 Months Ended
Provision for Taxes	Mar. 31, 2022
Disclosure Text Block [Abstract]
Provision for Taxes	Note 13. Provision for Taxes Earnings before taxes and the provision for taxes consisted of the following: Years Ended March 31, 2022 2021 2020 (In thousands) Pretax earnings: U.S. $ 1,431,155 $ 773,030 $ 372,687 Non-U.S. 44,342 23,628 5,437 Total pretax earnings $ 1,475,497 $ 796,658 $ 378,124 Current provision (benefit) Federal $ 189,488 $ 100,521 $ (373,817) State 55,518 16,572 (9,600) Non-U.S. 6,893 3,404 949 251,899 120,497 (382,468) Deferred provision (benefit) Federal 90,852 53,957 307,846 State 6,355 9,795 9,728 Non-U.S. 3,105 1,553 970 100,312 65,305 318,544 Provision for income tax expense (benefit) $ 352,211 $ 185,802 $ (63,924) Income taxes paid (net of income tax refunds received) $ ( 4,548 ) $ 29,044 $ 6,859 The difference between the tax provision at the statutory federal income tax rate and the tax provision attributable to income before taxes was as follows: Years Ended March 31, 2022 2021 2020 (In percentages) Statutory federal income tax rate 21.00 % 21.00 % 21.00 % Increase (reduction) in rate resulting from: NOL tax rate benefit – % – % (38.62) % State taxes, net of federal benefit 3.24 % 2.53 % 0.02 % Foreign rate differential 0.05 % – % 0.21 % Federal tax credits (0.19) % (0.99) % (0.53) % Transition tax – % – % – % Tax-exempt income (0.03) % (0.08) % (0.17) % Dividend received deduction – % (0.01) % (0.01) % Other (0.20) % 0.87 % 1.19 % Actual tax expense (benefit) of operations 23.87 % 23.32 % ( 16.91 ) % Significant components of our deferred tax assets and liabilities were as follows: March 31, 2022 2021 Deferred tax assets: (In thousands) Net operating loss and credit carry forwards $ 36,367 $ 30,432 Accrued expenses 114,152 109,740 Policy benefit and losses, claims and loss expenses payable, net 30,572 26,799 Operating leases 15,540 19,370 Total deferred tax assets $ 196,631 $ 186,341 Deferred tax liabilities: Property, plant and equipment $ 1,395,216 $ 1,280,703 Operating leases 15,540 19,370 Deferred policy acquisition costs 12,962 13,696 Unrealized gains 36,299 48,667 Other 1,972 2,394 Total deferred tax liabilities 1,461,989 1,364,830 Net deferred tax liability $ 1,265,358 $ 1,178,489 On March 27, 2020, former President Trump signed into U.S. federal law the Coronavirus Aid, Relief and Economic Security Act (the “CARES Act”), which was aimed at providing emergency assistance and health care for individuals, families, and businesses affected by COVID-19 global pandemic and generally supporting the U.S. economy. The CARES Act, among other things, includes provisions relating to refundable payroll tax credits, deferment of employer side social security payments, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations, increased limitations on qualified charitable contributions, and technical corrections to tax depreciation methods for qualified improvement property. In particular, the CARES Act allows for NOLs generated in 2018, 2019, or 2020 to be carried back 5 years. As a result, we filed applicable forms with the IRS to carryback net operating losses. The statutory tax rate for the carryback years was 35% as compared to 21% at present. Consequently, we recognized a benefit amount of $ 146.0 million for fiscal year 2020. These refund claims total approximately $ 366 million, of which we have received approximately $ 243 million in fiscal 2022 and are reflected in Prepaid expense. As refunds are received, they will reduce this amount. We have estimated and recorded the overall effects of the CARES Act and do not anticipate a material change. As a result, the NOL and credit carry-forwards in the above table are primarily attributable to state NOLs. As of March 31, 2022 and March 31, 2021, AMERCO had state NOLs of $ 458.5 million and $ 384.9 million, respectively, that will begin to expire March 31, 2023, if not utilized. On March 3, 2021, the IRS notifiied us that our federal inome tax returns for the tax years March 31, 2014, 2015, 2016, 2018 and 2019 were selected for examination. The IRS agent in charged confirmed that this is a limited scope examination arising out of NOL carryback claims and is a standard procedure for the IRS to process the refund. As such, the scope of the exam is expected to be limited to the items reported on Forms 1139 and related schedules only. As of now, we are still working with the IRS agent and there is no audit adjustment for any of the above tax periods. No additional income taxes have been provided for any remaining undistributed foreign earnings not subject to transition tax, or any additional outside basis difference inherent in these entities, as these amounts continue to be indefinitely reinvested in foreign operations. Determining the amount of unrecognized deferred tax liability related to any remaining undistributed foreign earnings not subject to the transition tax and additional outside basis difference in these entities (i.e., basis difference in excess of that subject to the one-time transition tax) is not practicable. The Company accounts for uncertainty in income taxes by recognizing the tax benefit or expense from an uncertain tax position only if it is more likely than not that the tax position will be sustained upon examination by the taxing authorities, based on the technical merits of the position. The Company measures the tax benefits and expenses recognized in the consolidated financial statements from such a position based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate resolution. A reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period are as follows: Unrecognized Tax Benefits March 31, 2022 2021 (In thousands) Unrecognized tax benefits beginning balance $ 31,069 $ 29,632 Revaluation based on change in after tax benefit – – Additions based on tax positions related to the current year 8,257 1,479 Reductions for tax positions of prior years – (42) Additions for tax provisions of prior years 9,525 – Unrecognized tax benefits ending balance $ 48,851 $ 31,069 We recognize interest related to unrecognized tax benefits as interest expense, and penalties as income tax expenses. As of March 31, 2022 and 2021, the amount of interest accrued on unrecognized tax benefits was $ 15.7 million and $ 14.3 million, net of tax. During the current year we recorded expense from interest in the amount of $ 1.4 million, net of tax. We file income tax returns in the U.S. federal jurisdiction, and various states and Canadian jurisdictions. While the Company has ongoing audits in Canada and various state jurisdictions, there have been no proposed or anticipated adjustments that would materially impact the financial statements. With some exceptions, we are no longer subject to audit for years prior to the fiscal year ended March 31, 2019.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 17
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 270
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Mar. 31, 2022
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Note 14. Employee Benefit Plans Profit Sharing Plans We provide tax-qualified profit sharing retirement plans for the benefit of eligible employees, former employees and retirees in the United States and Canada. The plans are designed to provide employees with an accumulation of funds for retirement on a tax-deferred basis and provide for annual discretionary employer contributions. Amounts to be contributed are determined by the President and Chairman of the Board of Directors (the “Board”) of the Company under the delegation of authority from the Board, pursuant to the terms of the Profit Sharing Plan. No contributions were made to the profit sharing plan during fiscal 2022, 2021 or 2020. We also provide an employee savings plan which allows participants to defer income under Section 401(k) of the Internal Revenue Code of 1986. ESOP Plan We sponsor an Employee Stock Ownership Plan (“ESOP”) that generally covers all employees with one year or more of service. The ESOP began as a leveraged plan where shares were pledged as collateral for its debt which was originally funded by U-Haul. We made annual contributions to the ESOP equal to the ESOP’s debt service. As the debt was repaid, shares were released from collateral and allocated to active employees, based on the proportion of debt service paid in the year. ESOP shares were committed to be released monthly and ESOP compensation expense was recorded based on the current market price at the end of the month. These shares then become outstanding for the earnings per share computations. In fiscal 2020 we de-levered the plan and now contributions are made at the discretion of management with expense being recognized upon the decision to contribute. ESOP compensation expense was $23.0 million, $23.0 million and $10.3 million for fiscal 2022, 2021 and 2020, respectively, which are included in operating expenses in the consolidated statements of operations. Listed below is a summary of these financing arrangements as of fiscal year-end: Outstanding as of Interest Payments Financing Date March 31, 2022 2022 2021 2020 (In thousands) July, 2009 – – – 9 February, 2016 – – – 229 Leveraged contributions to the Plan Trust during fiscal 2020 was $ 5.6 million. There was no leveraged contribution in fiscal 2022 and 2021. In fiscal 2022, 2021 and 2020, the Company made non-leveraged contributions of $ 23.0 million, $ 23.0 and $ 4.0 million, respectively to the Plan Trust. Shares held by the ESOP were as follows: Years Ended March 31, 2022 2021 (In thousands) Allocated shares 890 951 Unreleased shares - leveraged – – Fair value of unreleased shares - leveraged $ – $ – Unreleased shares - non-leveraged – – Fair value of unreleased shares - non-leveraged $ – $ – The fair value of unreleased shares issued prior to 1992 is defined as the historical cost of such shares. The fair value of unreleased shares issued subsequent to December 31, 1992 is defined as the trading value of such shares as of March 31, 2022 and March 31, 2021, respectively. During fiscals 2022 and 2021, we released for allocation 33,954 and 38,015 of non-leveraged shares, respectively. As of March 31, 2022, it is estimated there will be no shares committed to be released. Post Retirement and Post Employment Benefits We provide a health reimbursement benefit to our eligible U.S. employees and their eligible dependents upon retirement from the Company. The retiree must have attained age sixty-five and earned twenty years of full-time service upon retirement to be awarded the health reimbursement benefit. The health reimbursement benefit is capped at a $ 20,000 lifetime maximum per covered person. Reimbursements are coordinated with Medicare and any other medical policies in force. In addition, retirees who have attained age sixty-five and earned at least twenty years of full-time service upon retirement from the Company are entitled to group term life insurance benefits. The life insurance benefit is $ 3,000 plus $ 100 for each year of employment over twenty years. The benefits are not funded, and claims are paid as they are incurred. We use a March 31 measurement date for our post retirement benefit disclosures. The components of net periodic post retirement benefit cost were as follows: Years Ended March 31, 2022 2021 2020 (In thousands) Service cost for benefits earned during the period $ 1,401 $ 1,267 $ 1,055 Other components of net periodic benefit costs: Interest cost on accumulated postretirement benefit 908 919 964 Other components 212 68 90 Total other components of net periodic benefit costs 1,120 987 1,054 Net periodic postretirement benefit cost $ 2,521 $ 2,254 $ 2,109 The fiscal 2022 and fiscal 2021 post retirement benefit liability included the following components: Years Ended March 31, 2022 2021 (In thousands) Beginning of year $ 30,755 $ 27,503 Service cost for benefits earned during the period 1,401 1,267 Interest cost on accumulated post retirement benefit 908 919 Net benefit payments and expense (1,021) (841) Actuarial (gain) loss (1,837) 1,907 Accumulated postretirement benefit obligation 30,206 30,755 Current liabilities 1,449 1,334 Non-current liabilities 28,757 29,421 Total post retirement benefit liability recognized in statement of financial position 30,206 30,755 Components included in accumulated other comprehensive income (loss): Unrecognized net loss (3,237) (5,286) Cumulative net periodic benefit cost (in excess of employer contribution) $ 26,969 $ 25,469 The discount rate assumptions in computing the information above were as follows: Years Ended March 31, 2022 2021 2020 (In percentages) Accumulated postretirement benefit obligation 3.76 % 2.93 % 3.37 % In December 2003, the Medicare Prescription Drug Improvement and Modernization Act of 2003 became law. Net periodic post retirement benefit cost above includes the effect of the subsidy. The discount rate represents the expected yield on a portfolio of high grade (AA to AAA rated or equivalent) fixed income investments with cash flow streams sufficient to satisfy benefit obligations under the plan when due. Fluctuations in the discount rate assumptions primarily reflect changes in U.S. interest rates. The assumed health care cost trend rate used to measure the accumulated postretirement benefit obligation as of the end of fiscal 2022 was 4.9 % in the initial year and was projected to decline annually to an ultimate rate of 4.0 % in fiscal 2046. The assumed health care cost trend rate used to measure the accumulated post retirement benefit obligation as of the end of fiscal 2021 (and used to measure the fiscal 2022 net periodic benefit cost) was 5.0 % in the initial year and was projected to decline annually to an ultimate rate of 4.0 % in fiscal 2046. Post-employment benefits provided by us, other than upon retirement, are not material. Future net benefit payments are expected as follows: Future Net Benefit Payments (In thousands) Year-ended: 2023 $ 1,369 2024 1,536 2025 1,733 2026 1,950 2027 2,170 2028 Through 2032 12,112 Total $ 20,870

Fair Value Measurements	12 Months Ended
Fair Value Measurements	Mar. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 15. Fair Value Measurements Certain assets and liabilities are recorded at fair value on the consolidated balance sheets and are measured and classified based upon a three-tiered approach to valuation. Financial assets and liabilities recorded at fair value and are classified and disclosed in one of the following three categories: Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 – Quoted prices for identical or similar financial instruments in markets that are not considered to be active, or similar financial instruments for which all significant inputs are observable, either directly or indirectly, or inputs other than quoted prices that are observable, or inputs that are derived principally from or corroborated by observable market data through correlation or other means; and Level 3 – Prices or valuations that require inputs that are both significant to the fair value measurement and are unobservable. These reflect management’s assumptions about the assumptions a market participant would use in pricing the asset or liability. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Fair values of cash equivalents approximate carrying value due to the short period of time to maturity. Fair values of short-term investments, investments available-for-sale, long-term investments, mortgage loans and notes on real estate, and interest rate swap contracts are based on quoted market prices, dealer quotes or discounted cash flows. Fair values of trade receivables approximate their recorded value. Our financial instruments that are exposed to concentrations of credit risk consist primarily of temporary cash investments, trade receivables, reinsurance recoverables and notes receivable. Limited credit risk exists on trade receivables due to the diversity of our customer base and their dispersion across broad geographic markets. We place our temporary cash investments with financial institutions and limit the amount of credit exposure to any one financial institution. We have mortgage receivables, which potentially expose us to credit risk. The portfolio of notes is principally collateralized by self-storage facilities and commercial properties. We have not experienced any material losses related to the notes from individual or groups of notes in any particular industry or geographic area. The estimated fair values were determined using the discounted cash flow method and using interest rates currently offered for similar loans to borrowers with similar credit ratings. Other investments including short-term investments are substantially current or bear reasonable interest rates. As a result, the carrying values of these financial instruments approximate fair value. The carrying values and estimated fair values for the financial instruments stated above and their placement in the fair value hierarchy are as follows: Fair Value Hierarchy As of March 31, 2022 Carrying Value Level 1 Level 2 Level 3 Total Estimated Fair Value (In thousands) Assets Reinsurance recoverables and trade receivables, net $ 229,343 $ – $ – $ 229,343 $ 229,343 Mortgage loans, net 423,163 – – 423,163 450,347 Other investments 120,592 – – 120,592 120,592 Total $ 773,098 $ – $ – $ 773,098 $ 800,282 Liabilities Notes, loans and finance leases payable $ 6,059,713 $ – $ 6,059,713 $ – $ 5,875,781 Total $ 6,059,713 $ – $ 6,059,713 $ – $ 5,875,781 . Fair Value Hierarchy As of March 31, 2021 Carrying Value Level 1 Level 2 Level 3 Total Estimated Fair Value (In thousands) Assets Reinsurance recoverables and trade receivables, net $ 224,426 $ – $ – $ 224,426 $ 224,426 Mortgage loans, net 391,230 – – 391,230 391,230 Other investments 98,529 – – 98,529 98,529 Total $ 714,185 $ – $ – $ 714,185 $ 714,185 Liabilities Notes, loans and finance leases payable $ 4,698,615 – $ 4,698,615 $ – $ 4,449,691 Total $ 4,698,615 $ – $ 4,698,615 $ – $ 4,449,691 The following tables represent the financial assets and liabilities on the consolidated balance sheets as of March 31, 2022 and 2021, that are measured at fair value on a recurring basis and the level within the fair value hierarchy. As of March 31, 2022 Total Level 1 Level 2 Level 3 (In thousands) Assets Short-term investments $ 2,482,154 $ 2,482,154 $ – $ – Fixed maturities - available for sale 2,821,092 26,914 2,794,086 92 Preferred stock 26,095 26,095 – – Common stock 46,212 46,212 – – Derivatives 7,474 7,474 – – Total $ 5,383,027 $ 2,588,849 $ 2,794,086 $ 92 Liabilities Derivatives $ 587 $ – $ 587 $ – Total $ 587 $ – $ 587 $ – As of March 31, 2021 Total Level 1 Level 2 Level 3 (In thousands) Assets Short-term investments $ 839,250 $ 839,250 $ – $ – Fixed maturities - available for sale 2,653,539 6,967 2,646,415 157 Preferred stock 21,677 21,677 – – Common stock 20,440 20,440 – – Derivatives 6,601 6,601 – – Total $ 3,541,507 $ 894,935 $ 2,646,415 $ 157 Liabilities Derivatives $ 5,141 $ – $ 5,141 $ – Total $ 5,141 $ – $ 5,141 $ – The fair value measurement of our assets using significant unobservable inputs (Level 3) were $ 0.1 million and $ 0.2 million for March 31, 2022 and 2021, respectively.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Reinsurance and Policy Benefits and Losses, Claims and Loss Expenses Payable	12 Months Ended
	Mar. 31, 2022
Disclosure Text Block [Abstract]
Reinsurance and Policy Benefits and Losses, Claims and Loss Expenses Payable	Note 16. Reinsurance and Policy Benefits and Losses, Claims and Loss Expenses Payable During their normal course of business, our insurance subsidiaries assume and cede reinsurance on both a coinsurance and a risk premium basis. They also obtain reinsurance for that portion of risks exceeding their retention limits. The maximum amount of life insurance retained on any one life is $ 150,000 . Amount (a) Direct Other Companies Ceded to from Other Companies Assumed Amount (a) Net Amount Assumed to Net Percentage of (In thousands) Year ended December 31, 2021 Life insurance in force $ 1,029,537 $ 72 $ 328,030 $ 1,357,495 24 % Premiums earned: Life $ 56,353 $ 2 $ 4,514 $ 60,865 7 % Accident and health 48,385 160 1,166 49,391 2 % Annuity 444 – 327 771 42 % Property and casualty 89,667 – – 89,667 – % Total $ 194,849 $ 162 $ 6,007 $ 200,694 Year ended December 31, 2020 Life insurance in force $ 1,031,634 $ 73 $ 356,266 $ 1,387,827 26 % Premiums earned: Life $ 58,048 $ 1 $ 5,049 $ 63,096 8 % Accident and health 57,081 211 1,388 58,258 2 % Annuity 221 – 34 255 13 % Property and casualty 70,285 – – 70,285 – % Total $ 185,635 $ 212 $ 6,471 $ 191,894 Year ended December 31, 2019 Life insurance in force $ 957,280 $ 7 $ 441,563 $ 1,398,836 32 % Premiums earned: Life $ 53,289 $ 1 $ 5,629 $ 58,917 10 % Accident and health 66,863 226 1,563 68,200 2 % Annuity 65 – 794 859 92 % Property and casualty 69,126 – 15 69,141 – % Total $ 189,343 $ 227 $ 8,001 $ 197,117 (a) Balances are reported net of inter-segment transactions. Reserves for recognizing a premium deficiency included in future policy benefits are established, if necessary, when the liability for future policy benefits plus the present value of expected future gross premiums are determined to be materially insufficient to provide for expected future policy benefits and expenses. Additionally, in certain instances the policyholder liability for a particular line of business may not be deficient in the aggregate to trigger loss recognition, but the pattern of earnings may be such that profits are expected to be recognized in earlier years followed by losses in later years. In these situations, accounting standards require that an additional liability be recognized by an amount necessary to sufficiently offset the losses that would be recognized in later years. The Company has not recognized any reserves related to premium deficiencies in the years ended December 31, 2021 and December 31, 2020. To the extent that a reinsurer is unable to meet its obligation under the related reinsurance agreements, Repwest would remain liable for the unpaid losses and loss expenses. Pursuant to certain of these agreements, Repwest holds letters of credit as of December 31, 2021 in the amount of $0.1 million from re-insurers. Policy benefits and losses, claims and loss expenses payable for Property and Casualty Insurance were as follows: December 31, 2021 2020 (In thousands) Unpaid losses and loss adjustment expense $ 159,162 $ 177,963 Reinsurance losses payable 1,217 979 Total $ 160,379 $ 178,942 Activity in the liability for unpaid losses and loss adjustment expenses for Property and Casualty Insurance is summarized as follows: December 31, 2021 2020 2019 (In thousands) Balance at January 1 $ 177,963 $ 209,127 $ 228,970 Less: reinsurance recoverable 64,873 87,083 94,920 Net balance at January 1 113,090 122,044 134,050 Incurred related to: Current year 28,980 20,670 22,137 Prior years (6,290) (3,865) (9,535) Total incurred 22,690 16,805 12,602 Paid related to: Current year 11,040 7,664 7,366 Prior years 12,972 18,095 17,242 Total paid 24,012 25,759 24,608 Net balance at December 31 111,768 113,090 122,044 Plus: reinsurance recoverable 47,394 64,873 87,083 Balance at December 31 $ 159,162 $ 177,963 $ 209,127 Prior year incurred losses were impacted by favorable development on numerous Excess Workers Compensation claims. The liability for incurred losses and loss adjustment expenses (net of reinsurance recoverable of $47.4 million) decreased by $18.8 million as of December 31, 2021. The information about property and casualty incurred and paid loss and loss adjustment expense development for the years end December 31, 2015 through 2021, and the average annual percentage payout of incurred claims by age as of December 31, 2021, is presented as supplementary information. Claims data for December 31, 2015 through 2020 is unaudited. Claims data for December 31, 2021 is audited. Cumulative Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance As of December 31, 2021 Total of Incurred-but- Not-Reported Liabilities Plus Expected Cumulative Development Number of Accident on Reported Reported Year 2015 2016 2017 2018 2019 2020 2021 Claims Claims (In thousands, except claim counts) 2015 $ 12,214 $ 12,459 $ 12,460 $ 12,464 $ 11,087 $ 11,092 $ 11,093 $ – 11,104 2016 13,297 13,011 13,056 11,790 11,764 11,764 – 11,469 2017 15,748 16,109 17,078 15,538 15,273 – 12,102 2018 19,580 18,386 18,027 17,157 251 11,983 2019 22,138 26,316 27,316 2,283 11,746 2020 20,671 17,485 3,455 11,274 2021 28,982 12,709 13,729 Total 18,698 The following table presents paid claims development as of December 31, 2021, net of reinsurance. Claims data for 2015 through 2020 is unaudited. Claims data for 2021 is audited. Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (In thousands) Accident Year 2015 2016 2017 2018 2019 2020 2021 2015 $ 7,509 $ 9,601 $ 9,730 $ 10,343 $ 11,087 $ 11,092 $ 11,093 2016 7,777 10,665 11,643 11,746 11,764 11,764 2017 8,970 11,638 14,825 15,012 15,263 2018 8,838 12,689 15,150 16,766 2019 7,366 14,737 19,215 2020 7,665 11,114 2021 11,040 Total Total 96,255 All outstanding liabilities before 2015, net of reinsurance 78,955 Liabilities for claims and claim adjustment expenses, net of reinsurance 111,768 The reconciliation of the net incurred and paid claims development tables for the liability for claims and claims adjustment expenses is as follows: December 31, 2021 (In thousands) Liabilities for unpaid Property and Casualty claims and claim adjustment expenses, net of reinsurance $ 111,768 Total reinsurance recoverable on unpaid Property and Casualty claims $ 47,394 Total gross liability for unpaid Property and Casualty claims and claim adjustment expense $ 159,162 The following is supplementary information about average historical claims duration as of December 31, 2021. Average Annual Percentage Payout of Incurred Claims by Age, net of Reinsurance (In percentages) Years 1 2 3 4 5 6 7 Property and Casualty Insurance 50.4 % 21.7 % 12.2 % 4.3 % 2.8 % – % – %

Leases	12 Months Ended
Leases	Mar. 31, 2022
Leases [Abstract]
Leases Of Lessee Disclosure [Text Block]	Note 17. Leases Lessor We have determined that revenues derived by providing self-moving equipment rentals, self-storage rentals and certain other revenues, including U-Box rentals, are within the scope of the accounting guidance contained in Topic 842. We combined all lease and non-lease components of lease contracts for which the timing and pattern of transfer are the same and the lease component meets the classification of an operating lease, and account for them in accordance with Topic 842. The revenue streams accounted for in accordance with Topic 842 are recognized evenly over the period of rental. Please see Note 22, Revenue Recognition, of the Notes to Consolidated Financial Statements. Lessee We determine if an arrangement is a lease at inception. Operating leases, which are comprised primarily of storage rental locations, are included in ROU assets - operating, net and operating lease liabilities in our consolidated balance sheets. Finance leases, which are comprised primarily of rental equipment leases, are included in ROU assets - financing, net, and notes, loans and finance leases payable, net in our consolidated balance sheets. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the expected remaining lease term. We use our incremental borrowing rate based on information available at commencement date, including the rate for a fully collateralized loan that can either be fully amortized or financed with a residual at the end of the lease term, for a borrower with similar credit quality in order to determine the present value of lease payments. Our lease terms may include options to extend or terminate the lease, which are included in the calculation of ROU assets when it is reasonably certain that we will exercise those options. Lease expense for lease payments is recognized on a straight-line basis over the lease term. We have lease agreements with lease and non-lease components, which are generally not accounted for separately. Additionally, for certain leases, we apply a portfolio approach to account for the operating lease ROU assets and liabilities as the leases are similar in nature and have nearly identical contract provisions. Our equipment sale/leaseback transactions do not qualify as a sale. New sale leaseback transactions that fail to qualify as a sale are accounted for as a financial liability. Please see Note 8, Borrowings, of the Notes to Consolidated Financial Statements for additional information. The following table shows the components of our ROU assets, net: As of March 31, 2022 Finance Operating Total (In thousands) Buildings and improvements $ – $ 136,444 $ 136,444 Furniture and equipment 14,731 – 14,731 Rental trailers and other rental equipment 169,514 – 169,514 Rental trucks 1,114,248 – 1,114,248 Right-of-use assets, gross 1,298,493 136,444 1,434,937 Less: Accumulated depreciation (677,669) (62,062) (739,731) Right-of-use assets, net $ 620,824 $ 74,382 $ 695,206 As of March 31, 2021 Finance Operating Total (In thousands) Buildings and improvements $ – $ 132,901 $ 132,901 Furniture and equipment 22,316 – 22,316 Rental trailers and other rental equipment 203,594 – 203,594 Rental trucks 1,494,098 – 1,494,098 Right-of-use assets, gross 1,720,008 132,901 1,852,909 Less: Accumulated depreciation (842,970) (40,396) (883,366) Right-of-use assets, net $ 877,038 $ 92,505 $ 969,543 As of March 31, 2022 and 2021, we had finance leases for the ROU assets, net of $ 347.4 million and $ 513.6 million, respectively and operating leases of $ 74.2 million and $ 92.5 million, respectively. Financing leases March 31, 2022 2021 Weighted average remaining lease term (years) 3 3 Weighted average discount rate 3.7 % 3.6 % Operating leases March 31, 2022 2021 Weighted average remaining lease term (years) 16.5 14.7 Weighted average discount rate 4.6 % 4.6 % For fiscal years 2022, 2021 and 2020, cash paid for leases included in our operating cash flow activities were $ 30.2 million, $ 29.3 million and $ 25.9 million, respectively and our financing cash flow activities were $ 166.3 million, $ 221.2 million and $ 307.8 million, respectively. Non-cash activities of ROU assets in exchange for lease liabilities were $ 3.7 million, $ 6.8 million and $ 15.4 million for fiscal years 2022, 2021 and 2020, respectively. The components of lease costs, including leases of less than 12 months, were as follows: Twelve Months Ended March 31, 2022 2021 (In thousands) Operating lease costs $ 30,239 $ 30,551 Finance lease cost: Amortization of right-of-use assets $ 115,199 $ 150,994 Interest on lease liabilities 15,289 22,405 Total finance lease cost $ 130,488 $ 173,399 The short-term lease costs for fiscal years 2022 and 2021 were not material. Maturities of lease liabilities were as follows: Finance leases Operating leases Year ending March 31, (In thousands) 2023 $ 133,577 $ 23,311 2024 111,781 21,903 2025 78,280 10,630 2026 47,064 4,162 2027 – 3,061 Thereafter – 59,348 Total lease payments 370,702 122,415 Less: imputed interest (23,309) (48,218) Present value of lease liabilities $ 347,393 $ 74,197

Contingencies	12 Months Ended
Contingencies	Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Note 18. Contingencies Environmental Compliance with environmental requirements of federal, state and local governments may significantly affect Real Estate’s business operations. Among other things, these requirements regulate the discharge of materials into the air, land and water and govern the use and disposal of hazardous substances. Real Estate is aware of issues regarding hazardous substances on some of its properties. Real Estate regularly makes capital and operating expenditures to stay in compliance with environmental laws and has put in place a remedial plan at each site where it believes such a plan is necessary. Based upon the information currently available to Real Estate, compliance with the environmental laws and its share of the costs of investigation and cleanup of known hazardous waste sites are not expected to result in a material adverse effect on AMERCO’s financial position or results of operations. Other We are named as a defendant in various other litigation and claims arising out of the normal course of business. In management’s opinion, none of these other matters will have a material effect on our financial position and results of operations.

Related Party Transactions	12 Months Ended
Related Party Transactions	Mar. 31, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Note 19. Related Party Transactions As set forth in the Company’s Audit Committee Charter and consistent with NASDAQ Listing Rules, our Audit Committee (the “Audit Committee”) reviews and maintains oversight over related party transactions, which are required to be disclosed under the SEC rules and regulations and in accordance with GAAP. Accordingly, all such related party transactions are submitted to the Audit Committee for ongoing review and oversight. Our internal processes are designed to ensure that our legal and finance departments identify and monitor potential related party transactions that may require disclosure and Audit Committee oversight. AMERCO has engaged in related party transactions and has continuing related party interests with certain major stockholders, directors and officers of the consolidated group as disclosed below. SAC Holding Corporation and SAC Holding II Corporation (collectively “SAC Holdings”) were established in order to acquire and develop self-storage properties. These properties are being managed by us pursuant to management agreements. SAC Holdings, Four SAC Self-Storage Corporation, Five SAC Self-Storage Corporation, Galaxy Investments, L.P. and 2015 SAC Self-Storage, LLC are substantially controlled by Blackwater Investments, Inc. (“Blackwater”). Blackwater is wholly owned by Willow Grove Holdings LP, which is owned by Mark V. Shoen (a significant stockholder), and various trusts associated with Edward J. Shoen (our Chairman of the Board, President and a significant stockholder) and Mark V. Shoen. Related Party Revenues Years Ended March 31, 2022 2021 2020 (In thousands) U-Haul management fee revenue from Blackwater $ 28,546 $ 25,512 $ 24,014 U-Haul management fee revenue from Mercury 6,648 6,091 6,392 $ 35,194 $ 31,603 $ 30,406 We currently manage the self-storage properties owned or leased by Blackwater and Mercury Partners, L.P. (“Mercury”), pursuant to a standard form of management agreement, under which we receive a management fee of between 4 % and 10 % of the gross receipts plus reimbursement for certain expenses. We received management fees, exclusive of reimbursed expenses, of $ 38.5 million, $ 31.2 million and $ 29.0 million from the above-mentioned entities during fiscal 2022, 2021 and 2020, respectively. This management fee is consistent with the fee received for other properties we previously managed for third parties. Mark V. Shoen controls the general partner of Mercury. The limited partner interests of Mercury are owned indirectly by James P. Shoen and various trusts benefitting Edward J. Shoen and James P. Shoen or their descendants. Mercury holds the option to purchase a portfolio of properties currently leased by Mercury and a U-Haul subsidiary, which option is exercisable in 2024. Related Party Costs and Expenses Years Ended March 31, 2022 2021 2020 (In thousands) U-Haul lease expenses to Blackwater $ 2,445 $ 2,612 $ 2,631 U-Haul commission expenses to Blackwater 88,288 69,212 62,066 $ 90,733 $ 71,824 $ 64,697 We lease space for marketing company offices, vehicle repair shops and hitch installation centers from subsidiaries of Blackwater. The terms of the leases are similar to the terms of leases for other properties owned by unrelated parties that are leased to us. As of March 31, 2022, subsidiaries of Blackwater acted as U-Haul independent dealers. The financial and other terms of the dealership contracts with the aforementioned companies and their subsidiaries are substantially identical to the terms of those with our other independent dealers whereby commissions are paid by us based upon equipment rental revenues. These agreements and notes with subsidiaries of Blackwater, excluding Dealer Agreements, provided revenues of $ 28.5 million, expenses of $ 2.4 million and cash flows of $ 25.9 million during fiscal 2022. Revenues and commission expenses related to the Dealer Agreements were $ 417.9 million and $ 88.3 million, respectively for fiscal 2022. Management determined that we do not have a variable interest pursuant to the VIE model under ASC 810 in the holding entities of Blackwater. Related Party Assets March 31, 2022 2021 (In thousands) U-Haul receivable from Blackwater $ 41,364 $ 27,116 U-Haul receivable from Mercury 5,708 9,632 Other (a) 779 (1,353) $ 47,851 $ 35,395 (a) Timing differences for intercompany balances with insurance subsidiaries resulting from the three month difference in reporting periods.

Statutory Financial Information of Insurance Subsidiaries	12 Months Ended
	Mar. 31, 2022
Disclosure Text Block [Abstract]
Statutory Financial Information of Insurance Subsidiaries	Note 20. Statutory Financial Information of Insurance Subsidiaries Applicable laws and regulations of the States of Arizona and Nevada require Property and Casualty Insurance and Life Insurance to maintain minimum capital and surplus determined in accordance with statutory accounting principles. Audited statutory net income and statutory capital and surplus for the years ended are listed below: Years Ended December 31, 2021 2020 2019 (In thousands) Repwest: Audited statutory net income $ 33,314 $ 22,898 $ 28,614 Audited statutory capital and surplus 266,875 227,380 226,999 ARCOA: Audited statutory net income (loss) (752) 2,438 2,906 Audited statutory capital and surplus 14,697 15,928 12,851 Oxford: Audited statutory net income 23,217 6,296 18,599 Audited statutory capital and surplus 230,202 218,301 223,264 CFLIC: Audited statutory net income 6,019 8,082 8,043 Audited statutory capital and surplus 17,098 25,980 26,305 NAI: Audited statutory net income 1,874 2,127 1,942 Audited statutory capital and surplus 7,961 13,980 13,371 The amount of dividends that can be paid to shareholders by insurance companies domiciled in the State of Arizona is limited. There are restrictions on the ability of our insurance subsidiaries to transfer funds to us in the form of cash dividends, loans or advances. Their ordinary dividends are limited to the lower of 10% of prior year statutory surplus or prior year net income. Any extraordinary dividend, loans or advances to us from the insurance subsidiaries must be approved by the domiciliary insurance commissioner. Any dividend in excess of the limit requires prior regulatory approval. The statutory surplus for Repwest at December 31, 2021 that could be distributed as ordinary dividends was $26.7 million. The statutory surplus for Oxford at December 31, 2021 that could be distributed as ordinary dividends was $23.0 million. Repwest paid a dividend of $ $22.6 million and $21.6 million to AMERCO during fiscal 2021 and 2020, respectively. Repwest did not pay a dividend to AMERCO in fiscal 2022. Oxford paid a dividend of $18.6 million to AMERCO during fiscal 2021. Oxford did not pay a dividend to AMERCO in fiscal 2022 or 2020. Restricted net assets for our insurance subsidiaries were $ 91.7 million and $ 105.4 million as of December 31, 2021 and 2020, respectively. For our insurance subsidiaries, statutory accounting principles (“SAP”) differ from GAAP primarily in that: (i) premiums from deferred annuities are recognized as revenue under SAP, while they are accounted for as liabilities from investment contracts under GAAP; (ii) policy acquisition costs are expensed as incurred under SAP, while they are deferred and amortized over the effective period of the related life insurance policies or the present value of actual and expected gross profits from annuity deposits; (iii) policy benefits and losses are established using different actuarial assumptions; and (iv) investments are valued on a different basis and valuation allowances attributable to investments are different. In addition, certain assets are not admitted under SAP and are charged directly to surplus.

Financial Information by Geographic Area Data	12 Months Ended
Financial Information by Geographic Area Data	Mar. 31, 2022
Segments, Geographical Areas [Abstract]
Industry Segment and Geographic Area Data	Note 21. Financial Information by Geographic Area United States Canada Consolidated (All amounts are in thousands U.S. $'s) Fiscal Year Ended March 31, 2022 Total revenues $ 5,452,027 $ 287,720 $ 5,739,747 Depreciation and amortization, net of gains on disposal 509,517 2,969 512,486 Interest expense 163,586 3,838 167,424 Pretax earnings 1,431,155 44,342 1,475,497 Income tax expense 342,213 9,998 352,211 Identifiable assets 16,776,070 523,511 17,299,581 United States Canada Consolidated (All amounts are in thousands U.S. $'s) Fiscal Year Ended March 31, 2021 Total revenues $ 4,334,083 $ 207,902 $ 4,541,985 Depreciation and amortization, net of gains on disposal 631,344 10,160 641,504 Interest expense 160,429 3,073 163,502 Pretax earnings 773,030 23,628 796,658 Income tax expense 180,845 4,957 185,802 Identifiable assets 14,212,978 438,628 14,651,606 United States Canada Consolidated (All amounts are in thousands U.S. $'s) Fiscal Year Ended March 31, 2020 Total revenues $ 3,797,849 $ 181,019 $ 3,978,868 Depreciation and amortization, net of gains on disposal 652,110 15,414 667,524 Interest expense 157,595 3,355 160,950 Pretax earnings 372,687 5,437 378,124 Income tax expense (benefit) (65,842) 1,918 (63,924) Identifiable assets 13,016,942 421,082 13,438,024

Consolidating Financial Information by Industry Segment	12 Months Ended
Consolidating Financial Information by Industry Segment	Mar. 31, 2022
Segment Reporting [Abstract]
Consolidating Financial Information by Industry Segment	Note 21A. Consolidating Financial Information by Industry Segment AMERCO’s three reportable segments are: Moving and Storage, comprised of AMERCO, U-Haul, and Real Estate and the subsidiaries of U-Haul and Real Estate; Property and Casualty Insurance, comprised of Repwest and its subsidiaries and ARCOA; and Life Insurance, comprised of Oxford and its subsidiaries. Management tracks revenues separately, but does not report any separate measure of the profitability for rental vehicles, rentals of self-storage spaces and sales of products that are required to be classified as a separate operating segment and accordingly does not present these as separate reportable segments. Deferred income taxes, net are shown as liabilities on the consolidating statements. The information includes elimination entries necessary to consolidate AMERCO, the parent, with its subsidiaries. Investments in subsidiaries are accounted for by the parent using the equity method of accounting.

Revenue Recognition	12 Months Ended
Revenue Recognition	Mar. 31, 2022
Revenue From Contract With Customer [Abstract]
Revenue Recognition	Note 22. Revenue Recognition Revenue Recognized in Accordance with ASC Topic 606 ASC Topic 606, Revenue from Contracts with Customers (Topic 606) , outlines a five-step model for entities to use in accounting for revenue arising from contracts with customers. The standard applies to all contracts with customers except for leases, insurance contracts, financial instruments, certain nonmonetary exchanges and certain guarantees. The standard also requires disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. We enter into contracts that may include various combinations of products and services, which are generally capable of being distinct and accounted for as separate performance obligations. Revenue is recognized net of amounts collected from customers for taxes, such as sales tax, and remitted to the applicable taxing authorities. We account for a contract under Topic 606 when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. For contracts scoped into this standard, revenue is recognized when (or as) the performance obligations are satisfied by means of transferring goods or services to the customer as applicable to each revenue stream as discussed below. There were no material contract assets or liabilities for fiscal 2022. Sales of self-moving and self-storage related products are recognized at the time that title passes and the customer accepts delivery. The performance obligations identified for this portfolio of contracts include moving and storage product sales, installation services and/or propane sales. Each of these performance obligations has an observable stand-alone selling price. We concluded that the performance obligations identified are satisfied at a point in time. The basis for this conclusion is that the customer does not receive the product/propane or benefit from the installation services until the related performance obligation is satisfied. These products/services being provided have an alternative use as they are not customized and can be sold/provided to any customer. In addition, we only have the right to receive payment once the products have been transferred to the customer or the installation services have been completed. Although product sales have a right of return policy, our estimated obligation for future product returns is not material to the financial statements at this time. Property management fees are recognized over the period that agreed-upon services are provided. The performance obligation for this portfolio of contracts is property management services, which represents a series of distinct days of service, each of which is comprised of activities that may vary from day to day. However, those tasks are activities to fulfill the property management services and are not separate promises in the contract. We determined that each increment of the promised service is distinct. This is because the customer can benefit from each increment of service on its own and each increment of service is separately identifiable because no day of service significantly modifies or customizes another and no day of service significantly affects either the entity’s ability to fulfill another day of service or the benefit to the customer of another day of service. As such, we concluded that the performance obligation is satisfied over time. Additionally, in certain contracts the Company has the ability to earn an incentive fee based on operational results. We measure and recognize the progress toward completion of the performance obligation on a quarterly basis using the most likely amount method to determine an accrual for the incentive fee portion of the compensation received in exchange for the property management service. The variable consideration recognized is subject to constraints due to a range of possible consideration amounts based on actual operational results. Other revenue consists of numerous services or rentals, of which U-Box contracts and service fees from Moving Help are the main components. The performance obligations identified for U-Box contracts are fees for rental, storage and shipping of U-Box containers to a specified location, each of which are distinct. A contract may be partially within the scope of Topic 606 and partially within the scope of other topics. The rental and storage obligations in U-Box contracts meet the definition of a lease in Topic 842, while the shipping obligation represents a contract with a customer accounted for under Topic 606. Therefore, we allocate the total transaction price between the performance obligations of storage fees and rental fees and the shipping fees on a standalone selling price basis. U-Box shipping fees are collected once the shipment is in transit. Shipping fees in U-Box contracts are set at the initiation of the contract based on the shipping origin and destination, and the performance obligation is satisfied over time. U-Box shipping contracts span over a relatively short period of time, and the majority of these contracts begin and end within the same fiscal year. Moving Help services fees are recognized in accordance with Topic 606. Moving Help services are generated as we provide a neutral venue for the connection between the service provider and the customer for agreed upon services. We do not control the specified services provided by the service provider before that service is transferred to the customer. Revenue Recognized in Accordance with Topic 842 The Company’s self-moving rental revenues meet the definition of a lease pursuant to the guidance in Topic 842 because those substitution rights do not provide an economic benefit to the Company that would exceed the cost of exercising the right. Please see Note 17, Leases, of the Notes to Consolidated Financial Statements. Self-moving rentals are recognized over the contract period that trucks and moving equipment are rented. We offer two types of self-moving rental contracts, one-way rentals and in-town rentals, which have varying payment terms. Customer payment is received at the initiation of the contract for one-way rentals which covers an allowable limit for equipment usage. An estimated fee in the form of a deposit is received at the initiation of the contract for in-town rentals, and final payment is received upon the return of the equipment based on actual fees incurred. The contract price is estimated at the initiation of the contract, as there is variable consideration associated with ratable fees incurred based on the number of days the equipment is rented and the number of miles driven. Variable consideration is estimated using the most likely amount method which is based on the intended use of the rental equipment by the customer at the initiation of the contract. Historically, the variability in estimated transaction pricing compared to actual is not significant due to the relatively short duration of rental contracts. Each performance obligation has an observable stand-alone selling price. The input method of passage of time is appropriate as there is a direct relationship between our inputs and the transfer of benefit to the customer over the life of the contract. Self-moving rental contracts span a relatively short period of time, and the majority of these contracts began and ended within the same fiscal year. Self-storage revenues are recognized as earned over the contract period based upon the number of paid storage contract days. We lease portions of our operating properties to tenants under agreements that are classified as operating leases. We recognize the total minimum lease payments provided for under the leases on a straight-line basis over the lease term. Generally, under the terms of our leases, the majority of our rental expenses, including common area maintenance, real estate taxes and insurance, are recovered from our customers. The following table summarizes the minimum lease payments due from our customers and operating property tenants on leases for the next five years and thereafter: Year Ended March 31, 2023 2024 2025 2026 2027 Thereafter (In thousands) Self-moving equipment rentals $ 5,537 $ – $ – $ – $ – $ – Property lease revenues 16,544 11,063 8,180 6,381 5,254 43,931 Total $ 22,081 $ 11,063 $ 8,180 $ 6,381 $ 5,254 $ 43,931 The amounts above do not reflect future rental revenue from the renewal or replacement of existing leases. Revenue Recognized in Accordance with Other Topics Traditional life and Medicare supplement insurance premiums are recognized as revenue over the premium-paying periods of the contracts when due from the policyholders. For products where premiums are due over a significantly shorter duration than the period over which benefits are provided, such as our single premium whole life product, premiums are recognized when received and excess profits are deferred and recognized in relation to the insurance in force. Property and casualty insurance premiums are recognized as revenue over the policy periods. Interest and investment income are recognized as earned. Net investment and interest income has multiple components. Interest income from bonds and mortgage notes are recognized when earned. Dividends on common and preferred stocks are recognized on the ex-dividend dates. Realized gains and losses on the sale or exchange of investments are recognized at the trade date. In the following tables, the revenue is disaggregated by timing of revenue recognition: Years Ended March 31, 2022 2021 2020 (In thousands) Revenues recognized over time $ 284,401 $ 182,278 $ 147,565 Revenues recognized at a point in time 414,985 396,600 309,804 Total revenues recognized under ASC 606 699,386 578,878 457,369 Revenues recognized under ASC 842 4,690,434 3,644,798 3,182,902 Revenues recognized under ASC 944 201,666 195,371 200,768 Revenues recognized under ASC 320 148,261 122,938 137,829 Total revenues $ 5,739,747 $ 4,541,985 $ 3,978,868 In the above tables, the revenues recognized over time include property management fees, the shipping fees associated with U-Box rentals and a portion of other revenues. Revenues recognized at a point in time include self-moving equipment rentals, self-moving and self-storage products and service sales and a portion of other revenues. We recognized liabilities resulting from contracts with customers for self-moving equipment rentals, self-storage revenues, U-Box revenues and tenant revenue, in which the length of the contract goes beyond the reported period end, although rental periods of the equipment, storage and U-Box contract are generally short-term in nature. The timing of revenue recognition results in liabilities that are reflected in deferred income on the balance sheet.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 10
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 12
-Subparagraph (b)
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 12
-Subparagraph (e)
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045

+ Details

Allowance for Credit Losses	12 Months Ended
Allowance for Credit Losses	Mar. 31, 2022
Allowance For Credit Loss [Abstract]
Allowance For Credit Losses [Text Block]	Note 23 . Allowance for Credit Losses Mortgage loans, net Loans that management has the intent and ability to hold for the foreseeable future, or until maturity or payoff, are reported at amortized cost. Modeling for the Company’s mortgage loans is based on inputs most highly correlated to defaults, including loan-to-value, occupancy, and payment history. Historical credit loss experience provides additional support for the estimation of expected credit losses. In assessing the credit losses, the portfolio is reviewed on a collective basis, using loan-specific cash flows to determine the fair value of the collateral in the event of default. Adjustments to this analysis are made to assess loans with a loan-to-value of 65% or greater. These loan are evaluated on an individual basis and loan specific risk characteristics such as occupancy levels, expense, income growth and other relevant available information from internal and external sources relating to past events, current conditions, and reasonable and supportable forecasts. When management determines that credit losses are expected to occur, an allowance for expected credit losses based on the fair value of the collateral is recorded. Reinsurance recoverables Reinsurance recoverable on paid and unpaid benefits was less than 1 % of the total assets as of January 1, 2021 which is immaterial based on historical loss experience and high credit rating of the reinsurers. Premium receivables Premiums receivables were $ 1.7 million as of December 31, 2021, in which the credit loss allowance is immaterial based on our ability to cancel the policy if the policyholder doesn‘t pay premiums. The following details the changes in the Company’s reserve allowance for credit losses for trade receivables, fixed maturities and investments, other: Allowance for Credit Losses Trade Receivables Investments, Fixed Maturities Investments, other Total (In thousands) Balance as of March 31, 2020 $ 3,215 $ 503 $ 501 $ 4,219 Transition adjustment current expected credit losses 1,206 817 – 2,023 Write-offs against allowance – – – – Recoveries – – – – Balance as of March 31, 2021 $ 4,421 $ 1,320 $ 501 $ 6,242 Provision for (reversal of) credit losses 4,228 (1,260) – 2,968 Write-offs against allowance – – – – Recoveries – – – – Balance as of March 31, 2022 $ 8,649 $ 60 $ 501 $ 9,210

Subsequent Events	12 Months Ended
Subsequent Events	Mar. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	Note 24. Subsequent Events Our management has evaluated subsequent events occurring after March 31, 2022. We do not believe any subsequent events have occurred that would require further disclosure or adjustment to our financial statements.

Schedule I - Condensed Financial Information of Amerco	12 Months Ended
Schedule I - Condensed Financial Information of Amerco	Mar. 31, 2022
Disclosure Text Block [Abstract]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	SCHEDULE I CONDENSED FINANCIAL INFORMATION OF AMERCO BALANCE SHEETS March 31, 2022 2021 (In thousands) ASSETS Cash and cash equivalents $ 2,085,447 $ 751,053 Investment in subsidiaries 4,240,811 3,284,760 Related party assets 1,821,654 1,535,355 Other assets 178,691 413,167 Total assets $ 8,326,603 $ 5,984,335 LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities: Other liabilities $ 2,442,517 $ 1,136,742 2,442,517 1,136,742 Stockholders' equity: Preferred stock – – Common stock 10,497 10,497 Additional paid-in capital 454,029 454,029 Accumulated other comprehensive income (loss) 45,187 102,568 Retained earnings: Beginning of period 4,958,149 4,399,192 Adjustment for adoption of Topic 326 – (2,880) Net earnings 1,123,286 610,856 Dividends (29,412) (49,019) End of period 6,052,023 4,958,149 Cost of common shares in treasury (525,653) (525,653) Cost of preferred shares in treasury (151,997) (151,997) Total stockholders' equity 5,884,086 4,847,593 Total liabilities and stockholders' equity $ 8,326,603 $ 5,984,335 The accompanying notes are an integral part of these condensed financial statements. CONDENSED FINANCIAL INFORMATION OF AMERCO STATEMENTS OF OPERATIONS Years Ended March 31, 2022 2021 2020 (In thousands, except share and per share data) Revenues: Net interest income and other revenues $ 1,516 $ 720 $ 6,586 Expenses: Operating expenses 5,517 6,753 10,622 Other expenses 115 115 96 Total expenses 5,632 6,868 10,718 Equity in earnings of subsidiaries 1,011,841 508,632 205,940 Interest income 131,400 135,673 130,670 Pretax earnings 1,139,125 638,157 332,478 Income tax benfefit (expense) (15,839) (27,301) 109,570 Earnings available to common shareholders $ 1,123,286 $ 610,856 $ 442,048 Basic and diluted earnings per common share $ 57.29 $ 31.15 $ 22.55 Weighted average common shares outstanding: Basic and diluted 19,607,788 19,607,788 19,603,708 The accompanying notes are an integral part of these condensed financial statements. CONDENSED FINANCIAL INFORMATION OF AMERCO STATEMENTS OF comprehensive income Years Ended March 31, 2022 2021 2020 (In thousands) Net earnings $ 1,123,286 $ 610,856 $ 442,048 Other comprehensive income (loss) (60,473) 72,205 101,350 Total comprehensive income $ 1,062,813 $ 683,061 $ 543,398 The accompanying notes are an integral part of these condensed financial statements. CONDENSED FINANCIAL INFORMATION OF AMERCO STATEMENTS OF CASH FLOW Years Ended March 31, 2022 2021 2020 (In thousands) Cash flows from operating activities: Net earnings $ 1,123,286 $ 610,856 $ 442,048 Change in investments in subsidiaries (1,011,841) (508,632) (205,940) Adjustments to reconcile net earnings to cash provided by operations: Depreciation 1 1 1 Amortization of debt issuance costs 292 924 – Deferred income taxes 106,869 72,407 323,980 Net change in other operating assets and liabilities: Prepaid expenses 234,490 88,898 (381,190) Other assets (4) – 22 Related party assets (240) (12,000) – Accounts payable and accrued expenses 5,461 (4,019) 1,935 Net cash provided by operating activities 458,314 248,435 180,856 Cash flows from investing activities: Purchases of property, plant and equipment (11) (3) – Proceeds of property, plant and equipment – – – Net cash used by investing activities (11) (3) – Cash flows from financing activities: Borrowings from credit facilities 1,200,000 200,000 – Principal repayments on credit facilities – (200,000) – Debt issuance costs (8,468) (924) – Proceeds from (repayments) of intercompany loans (284,438) 211,064 (311,534) Common stock dividends paid (29,412) (49,019) (29,404) Net contribution from related party – 41,199 21,600 Net cash provided (used) by financing activities 877,682 202,320 (319,338) Effects of exchange rate on cash (1,591) 5,773 4,060 Increase (decrease) in cash and cash equivalents 1,334,394 456,525 (134,422) Cash and cash equivalents at beginning of period 751,053 294,528 428,950 Cash and cash equivalents at end of period $ 2,085,447 $ 751,053 $ 294,528 Income taxes paid (received), net of income taxes refunds received, amounted to ($4.5) million, $29.0 million and $6.9 million for fiscal 2022, 2021 and 2020, respectively. The accompanying notes are an integral part of these condensed financial statements.

Notes to Condensed Financial Information for Amerco Only - Amerco [Member]	12 Months Ended
	Mar. 31, 2022
1. Summary of Significant Accounting Policies	1. Summary of Significant Accounting Policies AMERCO, a Nevada corporation, was incorporated in April, 1969, and is the holding Company for U-Haul International, Inc., Amerco Real Estate Company, Repwest Insurance Company and Oxford Life Insurance Company. The financial statements of the Registrant should be read in conjunction with the Consolidated Financial Statements and notes thereto included in this Annual Report. AMERCO is included in a consolidated Federal income tax return with all of its U.S. subsidiaries. Accordingly, the provision for income taxes has been calculated for Federal income taxes of AMERCO and subsidiaries included in the consolidated return of AMERCO. State taxes for all subsidiaries are allocated to the respective subsidiaries. The financial statements include only the accounts of AMERCO, which include certain of the corporate operations of AMERCO. The interest in AMERCO’s majority owned subsidiaries is accounted for on the equity method. The intercompany interest income and expenses are eliminated in the Consolidated Financial Statements.
2. Guarantees	2. Guarantees AMERCO has guaranteed performance of certain long-term leases and other obligations. See Note 17, Leases, and Note 19, Related Party Transactions, of the Notes to Consolidated Financial Statements.

Schedule II - Amerco and Consolidated Subsidiaries Valuation and Qualifying Accounts	12 Months Ended
	Mar. 31, 2022
Disclosure Text Block [Abstract]
Schedule Of Valuation And Qualifying Accounts Disclosure [Text Block]	SCHEDULE II AMERCO AND CONSOLIDATED SUBSIDIARIES VALUATION AND QUALIFYING ACCOUNTS Balance at Beginning of Year Additions Charged to Costs and Expenses Additions Charged to Other Accounts Deductions Balance at Year End Year ended March 31, 2022 (In thousands) Allowance for credit losses (deducted from trade receivable) $ 4,421 $ 5,283 $ 1,679 $ (2,734) $ 8,649 Allowance for obsolescence (deducted from inventory) $ 1,416 $ – $ – $ (336) $ 1,080 Allowance for LIFO (deducted from inventory) $ 21,832 $ 15,568 $ – $ – $ 37,400 Allowance for probable losses (deducted from mortgage loans) $ 448 $ – $ – $ – $ 448 Year ended March 31, 2021 Allowance for credit losses (deducted from trade receivable) $ 535 $ 2,179 $ 2,680 $ (973) $ 4,421 Allowance for obsolescence (deducted from inventory) $ 3,063 $ – $ – $ (1,647) $ 1,416 Allowance for LIFO (deducted from inventory) $ 18,886 $ 2,946 $ – $ – $ 21,832 Allowance for probable losses (deducted from mortgage loans) $ 493 $ – $ – $ (45) $ 448 Year ended March 31, 2020 Allowance for doubtful accounts (deducted from trade receivable) $ 549 $ 731 $ – $ (745) $ 535 Allowance for obsolescence (deducted from inventory) $ 2,322 $ 741 $ – $ – $ 3,063 Allowance for LIFO (deducted from inventory) $ 18,987 $ – $ – $ (101) $ 18,886 Allowance for probable losses (deducted from mortgage loans)$ 493 $ – $ – $ – $ 493

Schedule V - Supplemental Information (for Property-Casualty Insurance Operations)	12 Months Ended
	Mar. 31, 2022
Disclosure Text Block [Abstract]
Schedule Of Supplemental Information For Property Casualty Insurance Underwriters [Text Block]	SCHEDULE V AMERCO AND CONSOLIDATED SUBSIDIARIES SUPPLEMENTAL INFORMATION (FOR PROPERTY-CASUALTY INSURANCE Operations) Years Ended December 31, 2021, 2020, AND 2019 Fiscal Year Affiliation with Registrant Deferred Policy Acquisition Cost Reserves for Unpaid Claims and Adjustment Expenses Discount if any, Deducted Unearned Premiums Net Earned Premiums (1) Net Investment Income (2) Claim and Claim Adjustment Expenses Incurred Related to Current Year Claim and Claim Adjustment Expenses Incurred Related to Prior Year Amortization of Deferred Policy Acquisition Costs Paid Claims and Claim Adjustment Expense Net Premiums Written (1) (In thousands) 2022 Consolidated property casualty entity $ – $ 159,162 $ – 334 $ 89,667 $ 24,385 $ 28,980 $ (6,290) $ – $ 24,012 $ 90,002 2021 Consolidated property casualty entity – 177,963 – (294) 70,285 16,335 20,670 (3,865) – 25,759 69,989 2020 Consolidated property casualty entity – 209,127 – 233 69,141 19,926 22,137 (9,535) – 24,608 66,277 (1)The earned and written premiums are reported net of intersegment transactions. There were $ 3.1 million, $ 1.5 million and $ 3.1 million in written premiums and $ 2.8 million, $ 1.8 million and $ 2.8 million in earned premiums eliminated for the years ended December 31, 2021, 2020 and 2019, respectively. (2) Net Investment Income excludes net realized (gains) losses on investments of ($1.0) million, ($0.1) million and ($0.4) million for the years ended December 31, 2021, 2020 and 2019, respectively.

Accounting Policies (Policy Text Block)	12 Months Ended
Accounting Policies (Policy Text Block)	Mar. 31, 2022
Policy Text Block [Abstract]
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with the generally accepted accounting principles (“GAAP”) in the United States requires management to make estimates and judgments that affect the amounts reported in the financial statements and accompanying notes. The accounting policies that we deem most critical to us and that require management’s most difficult and subjective judgments include the principles of consolidation, the recoverability of property, plant and equipment, the adequacy of insurance reserves, the recognition and measurement of impairments for investments accounted for under ASC 320 - Investments - Debt and Equity Securities and the recognition and measurement of income tax assets and liabilities. The actual results experienced by us may materially differ from management’s estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents We consider cash equivalents to be highly liquid debt securities with insignificant interest rate risk with original maturities from the date of purchase of three months or less. Financial instruments that potentially subject us to concentrations of credit risk consist principally of cash deposits. Accounts at each United States financial institution are insured by the Federal Deposit Insurance Corporation up to $ 250,000 . Accounts at each Canadian financial institution are insured by the Canada Deposit Insurance Corporation up to $ 100,000 CAD per account. As of March 31, 2022 and March 31, 2021, we held cash equivalents in excess of these insured limits. To mitigate this risk, we select financial institutions based on their credit ratings and financial strength.
Investments	Investments Fixed Maturities and Marketable Equities. Fixed maturity investments consist of either marketable debt, equity or redeemable preferred stocks. As of the balance sheet dates, all of our investments in these securities were classified as available-for-sale. Available-for-sale investments are reported at fair value, with unrealized gains or losses recorded net of taxes and applicable adjustments to deferred policy acquisition costs in stockholders’ equity. We adopted ASC Topic 326, Financial Instruments Credit Losses (“Topic 326”) as of April 1, 2020, for available-for-sale debt securities. This new standard requires the use of forward-looking information to estimate credit losses and requires credit losses for available for sale debt securities to be recorded through an allowance for credit losses rather than a reduction in the amortized cost basis. Changes in the market value of common stocks are recognized in earnings. Fair value for these investments is based on quoted market prices, dealer quotes or discounted cash flows. The cost of investments sold is based on the specific identification method. See Note 23, Allowance for Credit Losses, of the Notes to Consolidated Financial Statements. Mortgage Loans and Notes on Real Estate. Mortgage loans and notes on real estate are reported at their unpaid balance, net of any allowance for expected losses and any unamortized premium or discount. See Note 23, Allowance for Credit Losses, of the Notes to Consolidated Financial Statements. Recognition of Investment Income. Interest income from bonds and mortgage notes is recognized when earned. Dividends on common and preferred stocks are recognized on the ex-dividend dates. Realized gains and losses on the sale or exchange of investments are recognized at the trade date.
Derivative Financial Instruments	Accrued Interest Receivable Accrued interest receivables on available-for-sale securities totaled $28.7 million as of December 31, 2021 and are excluded from the estimate of credit losses. We have elected not to measure an allowance on accrued interest receivables as our practice is to write off the uncollectible balance in a timely manner. Furthermore, we have elected to write off accrued interest receivables by reversing interest income. Derivative Financial Instruments Our objective for holding derivative financial instruments is to manage interest rate risk exposure primarily through entering interest rate swap agreements and call options. We do not enter into these instruments for trading purposes. Counterparties to the interest rate swap agreements are major financial institutions. Derivatives are recognized at fair value on the balance sheet and are classified as prepaid expenses (asset) or accrued expenses (liability). Derivatives that are not designated as cash flow hedges for accounting purposes must be adjusted to fair value through income. If the derivative qualifies and is designated as a cash flow hedge, changes in its fair value will be recorded in accumulated other comprehensive income (loss) until the hedged item is recognized in earnings. See Note 10, Derivatives, of the Notes to Consolidated Financial Statements.
Inventory, net	Inventories and parts, net Inventories and parts, net were as follows: March 31, 2022 2021 (In thousands) Truck and trailer parts and accessories (a) $ 148,237 $ 95,976 Hitches and towing components (b) 32,508 19,972 Moving supplies and propane (b) 16,623 12,877 Subtotal 197,368 128,825 Less: LIFO reserves (37,400) (21,832) Less: excess and obsolete reserves (1,080) (1,416) Total $ 158,888 $ 105,577 (a) Primarily held for internal usage, including equipment manufacturing and repair (b) Primarily held for retail sales Inventories consist primarily of truck and trailer parts and accessories used to manufacture and repair rental equipment as well as products and accessories available for retail sale. Inventory is held at our owned locations; our independent dealers do not hold any of our inventory. Inventories are stated at the lower cost or net realizable value. Inventory cost is primarily determined using the last-in first-out method (“LIFO”). Inventories valued using LIFO consisted of approximately 93 % and 96 % of the total inventories for March 31, 2022 and 2021, respectively. Had we utilized the first-in first-out method (“FIFO”), stated inventory balances would have been $ 37.4 million and $ 21.8 million higher as of March 31, 2022 and 2021, respectively. In fiscal 2022, the negative effect on income due to liquidation of a portion of the LIFO inventory was $ 0.1 million.
Property, Plant and Equipment	Property, Plant and Equipment Our Property, plant and equipment is stated at cost. Interest expense, if any, incurred during the initial construction of buildings is considered part of cost. Depreciation is computed for financial reporting purposes using the straight line or an accelerated method based on a declining balance formula over the following estimated useful lives: rental equipment 2-20 years and buildings and non-rental equipment 3-55 years. Routine maintenance costs are charged to operating expense as they are incurred. Gains and losses on dispositions of property, plant and equipment, other than real estate (“personal property”), are netted against depreciation expense when realized. The net amount of gains, netted against depreciation expense, were $ 214.2 million, $ 54.1 million and $ 27.1 million during fiscal 2022, 2021 and 2020, respectively. Equipment depreciation is recognized in amounts expected to result in the recovery of estimated residual values upon disposal, i.e., minimize gains or losses. In determining the depreciation rate, historical disposal experience, holding periods and trends in the market for vehicles are reviewed. As a result of changes in Internal Revenue Service (“IRS”) regulations regarding the capitalization of assets, beginning in the first quarter of fiscal 2017, we raised the value threshold before certain assets are capitalized within our depreciation policy. This change in threshold, results in the immediate recognition of reported operating costs with a lagging decrease in depreciation expense over the term that these assets would have been depreciated. Due to this change, we had operating expenses of $ 28.7 million, $ 22.8 million and $ 26.9 million in fiscal 2022, 2021 and 2020, respectively. This change in threshold benefited us through the immediate recognition of tax deductible costs. We regularly perform reviews to determine whether facts and circumstances exist which indicate that the carrying amount of assets, including estimates of residual value, may not be recoverable or that the useful life of assets are shorter or longer than originally estimated. Reductions in residual values (i.e., the price at which we ultimately expect to dispose of revenue earning equipment) or useful lives will result in an increase in depreciation expense over the remaining life of the equipment. Reviews are performed based on vehicle class, generally subcategories of trucks and trailers. We assess the recoverability of our assets by comparing the projected undiscounted net cash flows associated with the related asset or group of assets over their estimated remaining lives against their respective carrying amounts. We consider factors such as current and expected future market price trends on used vehicles and the expected life of vehicles included in the fleet. Impairment, if any, is based on the excess of the carrying amount over the fair value of those assets. If asset residual values are determined to be recoverable, but the useful lives are shorter or longer than originally estimated, the net book value of the assets is depreciated over the newly determined remaining useful lives. For our box truck fleet we utilize an accelerated method of depreciation based upon a declining formula. Under the declining balances method (2.4 times declining balance), the book value of a rental truck is reduced approximately 16 %, 13 %, 11 %, 9 %, 8 %, 7 %, and 6 % during years one through seven, respectively and then reduced on a straight line basis to a salvage value of 15 % by the end of year fifteen. Comparatively, a standard straight line approach would reduce the book value by approximately 5.7 % per year over the life of the truck. Although we intend to sell our used vehicles for prices approximating book value, the extent to which we realize a gain or loss on the sale of used vehicles is dependent upon various factors including, but not limited to, the general state of the used vehicle market, the age and condition of the vehicle at the time of its disposal and the depreciation rates with respect to the vehicle . We typically sell our used vehicles at our sales centers throughout the United States and Canada, on our website at uhaul.com/trucksales or by phone at 1-866-404-0355. Additionally, we sell a large portion of our pickup and cargo van fleet at automobile dealer auctions. In addition to our property, plant and equipment, we had real estate held for future development or use of $67.8 million and $68.8 million for fiscal 2022 and 2021, respectively and is included in Investments, other.
Receivables	Receivables Trade receivables include trade accounts from moving and self-storage customers and dealers, insurance premiums and amounts due from re-insurers, less management’s estimate of expected losses. Moving and Storage has two (2) primary components of trade receivables, receivables from corporate customers and credit card receivables from sales and rentals of equipment. For credit card receivables, the Company uses a trailing 13 months average historical chargeback percentage of total credit card receivables. The Company rents equipment to corporate customers in which payment terms are 30 days. The Company performs ongoing credit evaluations of its customers and assesses each customer’s credit worthiness. In addition, the Company monitors collections and payments from its customers and maintains an allowance based upon applying an expected credit loss rate to receivables based on the historical loss rate from similar high risk customers adjusted for current conditions, including any specific customer collection issues identified, and forecasts of economic conditions. Delinquent account balances are written off after management has determined that the likelihood of collection is remote. Management believes that the historical loss information it has compiled is a reasonable base on which to determine expected credit losses for trade receivables because the composition of trade receivables as of that date is consistent with that used in developing the historical credit-loss percentages (i.e., the similar risk characteristics of its customers and its lending practices have not changed significantly over time). To adjust the historical loss rates to reflect the effects of these differences in current conditions and forecasted changes, management assigns a rating to each customer which varies depending on the assessment of risk. Management estimated the loss rate at approximately 6%. Management developed this estimate based on its knowledge of past experience. As a result, management applied the applicable credit loss rates to determine the expected credit loss estimate for each aging category. Insurance premiums receivable for policies that are billed through contracted agents are recorded net of commissions payable. A commission payable is recorded as a separate liability for those premiums that are billed direct. Reinsurance recoverables include case reserves and actuarial estimates of claims incurred but not reported ("IBNR"). These receivables are not expected to be collected until after the associated claim has been adjudicated and billed to the re-insurer. The reinsurance recoverables may have little or no allowance for credit losses due to the fact that reinsurance is typically procured from carriers with strong credit ratings. Furthermore, we do not cede losses to a re-insurer if the carrier is deemed financially unable to perform on the contract. Reinsurance recoverables also include insurance ceded to other insurance companies. The allowance for expected credit losses on trade receivables as of March 31, 2022 was $8.6 million. Notes and mortgage receivables include accrued interest and are reduced by discounts and amounts considered by management to be uncollectible.
Policy Benefits and Losses, Claims and Loss Expenses Payable	Policy Benefits and Losses, Claims and Loss Expenses Payable Liabilities for future policy benefits related to life insurance, Medical supplement insurance, and deferred annuities are determined by management utilizing the net premium valuation methodology and are accrued when premium revenue is recognized. The liability, which represents the present value of future benefits to be paid to policyholders and related expenses less the present value of future net premiums, is estimated using assumptions applicable at the time the insurance contracts are written, with provisions for the risk of adverse deviation, as appropriate. Assumptions include expected mortality and morbidity experience, policy lapses and surrenders, current asset yields and expenses, and expected interest rate yields. The Company periodically performs a gross premium valuation and reviews original assumptions, including capitalized expenses which reduce the gross premium valuation, to evaluate whether the assets and liabilities are adequate and whether a loss reserve should be recognized. Liabilities for health, disability and other policies include estimates of payments to be made on insurance claims for reported losses and estimates of IBNR losses. Oxford’s liabilities for deferred annuity contracts consist of contract account balances that accrue to the benefit of the policyholders. Property and Casualty Insurance’s liability for reported and unreported losses is based on Repwest’s historical data along with industry averages. The liability for unpaid loss adjustment expenses is based on historical ratios of loss adjustment expenses paid to losses paid. Amounts recoverable from re-insurers on unpaid losses are estimated in a manner consistent with the claim liability associated with the re-insured policy. Adjustments to the liability for unpaid losses and loss expenses as well as amounts recoverable from re-insurers on unpaid losses are charged or credited to expense in the periods in which they are made. Due to the nature of the underlying risks and high degree of uncertainty associated with the determination of the liability for future policy benefits and claims, the amounts to be ultimately paid to settle these liabilities cannot be precisely determined and may vary significantly from the estimated liability, especially for long-tailed casualty lines of business such as excess workers’ compensation. As a result of the long-tailed nature of the excess workers’ compensation policies written by Repwest during 1983 through 2001, it may take a number of years for claims to be fully reported and finally settled. On a regular basis insurance reserve adequacy is reviewed by management to determine if existing assumptions need to be updated. In determining the assumptions for calculating workers’ compensation reserves, management considers multiple factors including the following: Claimant longevity Cost trends associated with claimant treatments Changes in ceding entity and third party administrator reporting practices Changes in environmental factors including legal and regulatory Current conditions affecting claim settlements Future economic conditions including inflation We have reserved each claim based upon the accumulation of current claim costs projected through each claimant’s life expectancy and then adjusted for applicable reinsurance arrangements. Management reviews each claim bi-annually or more frequently, if there are changes in facts or circumstances to determine if the estimated life-time claim costs have increased and then adjusts the reserve estimate accordingly at that time. We have factored in an estimate of what the potential cost increases could be in our IBNR liability. We have not assumed settlement of the existing claims in calculating the reserve amount, unless it is in the final stages of completion. Continued increases in claim costs, including medical inflation and new treatments and medications could lead to future adverse development resulting in additional reserve strengthening. Conversely, settlement of existing claims or if injured workers return to work or expire prematurely, could lead to future positive development.
Self-Insurance Reserves	Self-Insurance Reserves U-Haul retains the risk for certain public liability and property damage programs related to our rental equipment. The consolidated balance sheets include $ 418.9 million and $ 427.1 million of liabilities related to these programs as of March 31, 2022 and 2021, respectively. These liabilities are recorded in Policy benefits and losses, claims and loss expenses payable. Management takes into account losses incurred based upon actuarial estimates, past experience, current claim trends, as well as social and economic conditions. This liability is subject to change in the future based upon changes in the underlying assumptions including claims experience, frequency of incidents, and severity of incidents. Additionally, as of March 31, 2022 and 2021, the consolidated balance sheets include liabilities of $ 19.7 million and $ 17.5 million, respectively, related to medical plan benefits we provide for eligible employees. We estimate this liability based on actual claims outstanding as of the balance sheet date as well as an actuarial estimate of IBNR claims. These amounts are recorded in Accounts payable and accrued expenses on the consolidated balance sheets.
Revenue Recognition	Revenue Recognition Self-moving rentals are recognized for the period that trucks and moving equipment are rented. Self-storage revenues, based upon the number of paid storage contract days, are recognized as earned during the period. Sales of self-moving and self-storage related products are recognized at the time that title passes and the customer accepts delivery. Property and casualty insurance premiums are recognized as revenue over the policy periods. Traditional life and Medicare supplement insurance premiums are recognized as revenue over the premium-paying periods of the contracts when due from the policyholders. For products where premiums are due over a significantly shorter duration than the period over which benefits are provided, such as our single premium whole life product, premiums are recognized when received and excess profits are deferred and recognized in relation to the insurance in force. Interest and investment income are recognized as earned. Amounts collected from customers for sales tax are recorded on a net basis. Please see Note 22, Revenue Recognition, of the Notes to Consolidated Financial Statements.
Advertising	Advertising All advertising costs are expensed as incurred. Advertising expense was $ 13.7 million, $ 18.0 million and $ 13.7 million in fiscal 2022, 2021 and 2020, respectively.
Deferred Policy Acquisition Cost	Deferred Policy Acquisition Costs Commissions and other costs that fluctuate with and are primarily related to the successful acquisition or renewal of certain insurance premiums are deferred. For our Life Insurance’s life and health insurance products, these costs are amortized, with interest, in relation to revenue such that costs are realized as a constant percentage of revenue. For its annuity insurance products the costs are amortized, with interest, in relation to the present value of actual and expected gross profits. Starting in fiscal 2014, new annuity contract holders were provided with a sales inducement in the form of a premium bonus (the “Sales Inducement Asset”). Sales inducements are recognized as an asset with a corresponding increase to the policyholder liability and are amortized in a similar manner to Deferred Policy Acquisition Costs. As of December 31, 2021 and 2020, the Sales Inducement Asset included with Deferred Policy Acquisition Costs amounted to $ 15.7 million and $ 16.0 million, respectively on the consolidated balance sheet and amortization expense totaled $ 4.7 million, $ 4.3 million and $ 5.5 million for the periods ended December 31, 2021, 2020 and 2019, respectively.
Environmental Costs	Environmental Costs Liabilities are recorded when environmental assessments and remedial efforts, if applicable, are probable and the costs can be reasonably estimated. The amount of the liability is based on management’s best estimate of undiscounted future costs. Certain recoverable environmental costs related to the removal of underground storage tanks or related contamination are capitalized and amortized over the estimated useful lives of the properties. These costs are capitalized if they improve the safety or efficiency of the property or are incurred in preparing the property for sale.
Income Taxes	Income Taxes AMERCO files a consolidated tax return with all of its legal subsidiaries. The provision for income taxes reflects deferred income taxes resulting from changes in temporary differences between the tax basis of assets and liabilities and their reported amounts in the financial statements. Deferred tax assets and liabilities represent the future tax consequence for those differences, which will either be taxable or deductible when the assets and liabilities are recovered or settled. Deferred taxes are also recognized for operating losses that are available to offset future taxable income. Valuation allowances are established when it is more likely than not that the deferred tax assets will not be realized.
Comprehensive Income (Loss)	Earnings Per Share Our earnings per share is calculated by dividing our earnings available to common stockholders by the weighted average common shares outstanding, basic and diluted. The weighted average common shares outstanding exclude post-1992 shares of the employee stock ownership plan that have not been committed to be released. As of March 31, 2022 and 2021 all of these shares have been released. There are no dilutive securities for fiscal years 2022, 2021 and 2020. Comprehensive Income (Loss) Comprehensive income (loss) consists of net earnings, foreign currency translation adjustments, unrealized gains and losses on investments, the change in fair value of cash flow hedges and the change in postretirement benefit obligations.
Debt issuance costs	Debt Issuance Costs We defer costs directly associated with acquiring third-party financing. Debt issuance costs are deferred and amortized to interest expense using the effective interest method. Debt issuance costs related to our long-term debt are reflected as a direct deduction from the carrying amount of the debt. Please see Note 8, Borrowings, of the Notes to Consolidated Financial Statements.
Adoption of New Accounting Pronouncements	Adoption of New Accounting Pronouncements On April 1, 2021, we adopted ASU 2020-08, Clarifying Guidance on Amortization of the Excess of the Cost Basis of Certain Callable Debt Securities Over the Amount Repayable. This standard requires that, for each reporting period, callable debt securities be reevaluated to determine if they remain subject to the guidance, which will depend on the amortized cost basis of the security and the terms of the next call option. The guidance is effective for fiscal years beginning after December 15, 2020. The adoption of the standard did not have a material impact on our consolidated financial statements. On April 1, 2021, we adopted, ASU 2020-04, Reference Rate Reform (Topic 848), Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”). This standard provides temporary optional expedients and exceptions to the US GAAP guidance on contract modifications and hedge accounting to ease the financial reporting burdens of the expected market transition from the London Inter-Bank Offer Rate (“LIBOR”) and other interbank offered rates to alternative reference rates, such as Secured Overnight Financing Rate. Entities can elect not to apply certain modification accounting requirements to contracts affected by what the guidance calls reference rate reform, if certain criteria are met. An entity that makes this election would not have to remeasure the contracts at the modification date or reassess a previous accounting determination. The guidance is effective upon issuance and generally can be applied through December 31, 2022. We adopted this standard and there was no impact to our consolidated financial statements. In January 2021, FASB issued ASU 2021-01, Reference Rate Reform (Topic 848), (“ASU 2021-01”). The amendments in ASU 2021-01 provide optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued because of the reference rate reform. We adopted ASU 2021-01 on a prospective basis effect and there was no impact to our consolidated financial statements.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In August 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-12, Targeted Improvements to the Accounting for Long-Duration Contracts (“ASU 2018-12”). The amendments in this update require insurance companies to annually review and update the assumptions used for measuring the liability under long-duration contracts, such as life insurance, disability income, and annuities. The amendment prescribes standardized liability discount rate, consistency in measurement of market risk benefits, simplified amortization of deferred acquisition costs and enhanced disclosures. The amendments are effective for fiscal years, and interim periods within those fiscal years, beginning after December 31, 2020. In November 2020, FASB issued ASU 2020-11, Financial Services – Insurance (Topic 944) , which deferred the effective date of ASU 2018-12 to years beginning after December 15, 2022. We are currently in the process of evaluating the impact of the adoption of ASU 2018-12 on our financial statements; however, the adoption of ASU 2018-12 will impact the statements of operations because the effect of any update to the assumptions we used at the inception of the contracts will be recorded in net income. From time to time, new accounting pronouncements are issued by the FASB or the Securities and Exchange Commission (“SEC”) that are adopted by us as of the specified effective date. Unless otherwise discussed, these ASUs entail technical corrections to existing guidance or affect guidance related to specialized industries or entities and therefore will have minimal, if any, impact on our financial position or results of operations upon adoption.

Accounting Policies (Table Text Block)	12 Months Ended
Accounting Policies (Table Text Block)	Mar. 31, 2022
Inventory Disclosure [Abstract]
Inventories, net	March 31, 2022 2021 (In thousands) Truck and trailer parts and accessories (a) $ 148,237 $ 95,976 Hitches and towing components (b) 32,508 19,972 Moving supplies and propane (b) 16,623 12,877 Subtotal 197,368 128,825 Less: LIFO reserves (37,400) (21,832) Less: excess and obsolete reserves (1,080) (1,416) Total $ 158,888 $ 105,577 (a) Primarily held for internal usage, including equipment manufacturing and repair (b) Primarily held for retail sales

Reinsurance Recoverables and Trade Receivables, Net (Table Text Block)	12 Months Ended
	Mar. 31, 2022
Reinsurance Recoverables and Trade Receivables, Net [Abstract]
Reinsurance Recoverables and Trade Receivables, Net	March 31, 2022 2021 (In thousands) Reinsurance recoverable $ 50,586 $ 66,386 Trade accounts receivable 150,285 121,251 Paid losses recoverable 345 276 Accrued investment income 28,689 27,883 Premiums and agents' balances 1,650 2,546 Independent dealer receivable 73 258 Other receivables 6,364 10,247 237,992 228,847 Less: Allowance for credit losses (8,649) (4,421) $ 229,343 $ 224,426

Investments (Table Text Block)	12 Months Ended
Investments (Table Text Block)	Mar. 31, 2022	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Available-for-Sale Investments	Amortized Gross Gross Gross Allowance for Expected Credit Losses Fair (In thousands) U.S. treasury securities and government obligations $ 128,078 $ 7,984 $ – $ (969) $ – $ 135,093 U.S. government agency mortgage-backed securities 44,678 280 (42) (3,111) – 41,805 Obligations of states and political subdivisions 178,040 15,450 – (508) – 192,982 Corporate securities 1,989,212 138,909 (402) (6,604) (60) 2,121,055 Mortgage-backed securities 324,029 7,671 (1) (1,542) – 330,157 $ 2,664,037 $ 170,294 $ ( 445 )$ ( 12,734 )$ ( 60 )$ 2,821,092	Amortized Gross Gross Gross Allowance for Expected Credit Losses Fair (in thousands) U.S. treasury securities and government obligations $ 92,429 $ 12,941 $ – $ – $ – $ 105,370 U.S. government agency mortgage-backed securities 61,427 911 (1) (132) – 62,205 Obligations of states and political subdivisions 230,521 25,249 (59) (3) – 255,708 Corporate securities 1,846,507 199,447 (163) (640) (1,320) 2,043,831 Mortgage-backed securities 174,728 11,706 (1) (8) – 186,425 $ 2,405,612 $ 250,254 $( 224 )$( 783 )$( 1,320 )$ 2,653,539
Adjusted Cost and Estimated Market Value of Available-for-sale Investments	March 31, 2022 March 31, 2021 Amortized Fair Amortized Fair (In thousands) Due in one year or less $ 97,969 $ 99,432 $ 90,142 $ 91,190 Due after one year through five years 541,840 570,135 562,442 601,818 Due after five years through ten years 704,295 765,073 672,733 754,536 Due after ten years 995,904 1,056,295 905,567 1,019,570 2,340,008 2,490,935 2,230,884 2,467,114 Mortgage backed securities 324,029 330,157 174,728 186,425 $ 2,664,037 $ 2,821,092 $ 2,405,612 $ 2,653,539
Available for sale equity investments	March 31, 2022 March 31, 2021 Amortized Fair Amortized Fair (In thousands) Common stocks $ 27,674 $ 46,212 $ 9,775 $ 20,440 Non-redeemable preferred stocks 26,054 26,095 20,034 21,677 $ 53,728 $ 72,307 $ 29,809 $ 42,117
Carrying Value of Other Investments	March 31, 2022 2021 (In thousands) Mortgage loans, net $ 423,163 $ 391,230 Short-term investments 30,916 7,234 Real estate 67,824 68,813 Policy loans 10,309 11,163 Other equity investments 11,543 11,319 $ 543,755 $ 489,759

Other Assets (Table Text Block)	12 Months Ended
Other Assets (Table Text Block)	Mar. 31, 2022
Other Assets [Abstract]
Other Assets	March 31, 2022 2021 (In thousands) Deposits (debt-related) $ 37,588 $ 33,952 Cash surrender value of life insurance policies – 567 Deposits (real estate related) 22,821 13,211 $ 60,409 $ 47,730

Net Investment and Interest Income (Table Text Block)	12 Months Ended
Net Investment and Interest Income (Table Text Block)	Mar. 31, 2022
Table Text Block [Abstract]
Net Investment and Interest Income	Years Ended March 31, 2022 2021 2020 (In thousands) Fixed maturities $ 111,625 $ 102,021 $ 107,434 Real estate 5,648 5,769 7,304 Insurance policy loans 705 829 974 Mortgage loans 25,850 18,248 17,164 Short-term, amounts held by ceding reinsurers, net and other investments 11,713 3,103 9,807 Investment income 155,541 129,970 142,683 Less: investment expenses (7,280) (7,032) (4,854) Net investment and interest income$ 148,261 $ 122,938 $ 137,829

Borrowings (Table Text Block)	12 Months Ended
Borrowings (Table Text Block)	Mar. 31, 2022
Debt Instruments [Abstract]
Long-Term Debt	March 31, 2022 Rates Maturities 2022 2021 (In thousands) Real estate loan (amortizing term) 1.83 % 2023 $ 50,259 $ 82,913 Senior mortgages 2.70 % - 5.50 % 2023 - 2042 2,206,268 2,125,324 Real estate loans (revolving credit) (a) 1.58 % - 3.14 % 2023 - 2025 535,000 535,000 Fleet loans (amortizing term) 1.61 % - 4.66 % 2022 - 2028 124,651 176,295 Fleet loans (revolving credit) 1.30 % - 2.36 % 2024 - 2026 560,000 535,000 Finance leases (rental equipment) 2.16 % - 5.04 % 2022 - 2026 347,393 513,623 Finance liability (rental equipment) 1.60 % - 4.68 % 2024 - 2030 949,936 644,375 Private placements 2.43 % - 2.88 % 2029 - 2035 1,200,000 – Other obligations 1.50 % - 8.00 % 2022 - 2049 86,206 86,085 Notes, loans and finance leases payable $ 6,059,713 $ 4,698,615 Less: Debt issuance costs (37,216) (29,708) Total notes, loans and finance leases payable, net $ 6,022,497 $ 4,668,907 (a) Certain loans have interest rate swaps fixing the rate between 3.03% and 3.14% based on current margin
Annual Maturities of Notes, Loans and Leases Payable	Years Ended March 31, 2023 2024 2025 2026 2027 Thereafter Total (In thousands) Notes, loans and finance leases payable, secured$ 478,954 $ 937,542 $ 898,740 $ 570,127 $ 559,961 $ 2,614,389 $ 6,059,713

Interest on Borrowings (Table Text Block)	12 Months Ended
Interest on Borrowings (Table Text Block)	Mar. 31, 2022
Interest Expense, Borrowings [Abstract]
Components of interest expense	Years Ended March 31, 2022 2021 2020 (In thousands) Interest expense $ 167,618 $ 165,484 $ 180,444 Capitalized interest (9,700) (11,573) (23,517) Amortization of transaction costs 5,556 5,949 4,427 Interest expense resulting from cash flow hedges 3,950 3,642 (404) Total interest expense 167,424 163,502 160,950
Interest rates and company borrowings	Revolving Credit Activity Years Ended March 31, 2022 2021 2020 (In thousands, except interest rates) Weighted average interest rate during the year 1.40 % 1.40 % 3.31 % Interest rate at year end 1.49 % 1.40 % 2.86 % Maximum amount outstanding during the year $ 1,105,000 $ 1,175,000 $ 1,086,000 Average amount outstanding during the year $ 1,085,074 $ 1,088,293 $ 1,002,081 Facility fees$ 253 $ 261 $ 193

Derivatives (Table Text Block)	12 Months Ended
Derivatives (Table Text Block)	Mar. 31, 2022
Derivative Instrument Detail [Abstract]
Derivative Fair Values Located in Accounts Payable and Accrued Expenses in the Balance Sheet	March 31, 2022 March 31, 2021 (In thousands) Interest rate contracts designated as hedging instruments Assets $ – $ – Liabilities 587 5,141 Notional amount (debt) 235,000 235,000
Effect of Interest Rate Contracts on the Statement of Operations	The Effect of Interest Rate Contracts on the Statements of Operations Years Ended March 31, 2022 2021 2020 (In thousands) (Gain) loss recognized in AOCI on interest rate contracts $ (4,553) $ (3,071) $ 8,355 (Gain) loss reclassified from AOCI into income $( 3,948 )$( 3,640 )$ 3

Accumulated Other Comprehensive Income (Table Text Block)	12 Months Ended
	Mar. 31, 2022
Table Text Block [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Foreign Currency Translation Unrealized Net Gain on Investments Fair Value of Cash Flow Hedges Postretirement Benefit Obligation Net Loss Accumulated Other Comprehensive Income (Loss) (In thousands) Balance as of March 31, 2019 $ (56,612) $ (7,259) $ 107 $ (2,934) $ (66,698) Foreign currency translation 9,377 – – – 9,377 Unrealized net gain on investments – 97,943 – – 97,943 Change in fair value of cash flow hedges – – (6,301) – (6,301) Amounts reclassified into earnings on hedging activities – – (2) – (2) Change in post retirement benefit obligations – – – 333 333 Other comprehensive income (loss) 9,377 97,943 (6,303) 333 101,350 Balance as of March 31, 2020 $ (47,235) $ 90,684 $ (6,196) $ (2,601) $ 34,652 Foreign currency translation (5,694) – – – (5,694) Unrealized net gain on investments – 76,969 – – 76,969 Change in fair value of cash flow hedges – – (429) – (429) Amounts reclassified into earnings on hedging activities – – 2,746 – 2,746 Change in post retirement benefit obligations – – – (1,387) (1,387) Other comprehensive income (loss) (5,694) 76,969 2,317 (1,387) 72,205 Balance as of March 31, 2021 $ (52,929) $ 167,653 $ (3,879) $ (3,988) $ 106,857 Foreign currency translation (2,828) – – – (2,828) Unrealized net loss on investments – (62,626) – – (62,626) Change in fair value of cash flow hedges – – 457 – 457 Amounts reclassified into earnings on hedging activities – – 2,978 – 2,978 Change in post retirement benefit obligations – – – 1,546 1,546 Other comprehensive income (loss) (2,828) (62,626) 3,435 1,546 (60,473) Balance as of March 31, 2022$( 55,757 )$ 105,027 $ ( 444 )$ ( 2,442 )$ 46,384

Stockholders' Equity (Table Text Block)	12 Months Ended
Stockholders' Equity (Table Text Block)	Mar. 31, 2022
Stockholders' Equity Note [Abstract]
Common Stock Dividends	Common Stock Dividends Declared Date Per Share Amount Record Date Dividend Date October 6, 2021 $ 0.50 October 18, 2021 October 29, 2021 August 19, 2021 $ 0.50 September 7, 2021 September 21, 2021 June 9, 2021 $ 0.50 June 24, 2021 July 8, 2021 December 9, 2020 $ 2.00 December 21, 2020 December 30, 2020 August 20, 2020$ 0.50 September 7, 2020 September 21, 2020

Provision for Taxes (Table Text Block)	12 Months Ended
Provision for Taxes (Table Text Block)	Mar. 31, 2022
Table Text Block [Abstract]
Provision For Taxes	Years Ended March 31, 2022 2021 2020 (In thousands) Pretax earnings: U.S. $ 1,431,155 $ 773,030 $ 372,687 Non-U.S. 44,342 23,628 5,437 Total pretax earnings $ 1,475,497 $ 796,658 $ 378,124 Current provision (benefit) Federal $ 189,488 $ 100,521 $ (373,817) State 55,518 16,572 (9,600) Non-U.S. 6,893 3,404 949 251,899 120,497 (382,468) Deferred provision (benefit) Federal 90,852 53,957 307,846 State 6,355 9,795 9,728 Non-U.S. 3,105 1,553 970 100,312 65,305 318,544 Provision for income tax expense (benefit) $ 352,211 $ 185,802 $ (63,924) Income taxes paid (net of income tax refunds received)$( 4,548 )$ 29,044 $ 6,859
Schedule of Effective Income Tax Rate Reconciliation	Years Ended March 31, 2022 2021 2020 (In percentages) Statutory federal income tax rate 21.00 % 21.00 % 21.00 % Increase (reduction) in rate resulting from: NOL tax rate benefit – % – % (38.62) % State taxes, net of federal benefit 3.24 % 2.53 % 0.02 % Foreign rate differential 0.05 % – % 0.21 % Federal tax credits (0.19) % (0.99) % (0.53) % Transition tax – % – % – % Tax-exempt income (0.03) % (0.08) % (0.17) % Dividend received deduction – % (0.01) % (0.01) % Other (0.20) % 0.87 % 1.19 % Actual tax expense (benefit) of operations 23.87 % 23.32 %( 16.91 )%
Components of Deferred Tax Assets and Liabilities	March 31, 2022 2021 Deferred tax assets: (In thousands) Net operating loss and credit carry forwards $ 36,367 $ 30,432 Accrued expenses 114,152 109,740 Policy benefit and losses, claims and loss expenses payable, net 30,572 26,799 Operating leases 15,540 19,370 Total deferred tax assets $ 196,631 $ 186,341 Deferred tax liabilities: Property, plant and equipment $ 1,395,216 $ 1,280,703 Operating leases 15,540 19,370 Deferred policy acquisition costs 12,962 13,696 Unrealized gains 36,299 48,667 Other 1,972 2,394 Total deferred tax liabilities 1,461,989 1,364,830 Net deferred tax liability$ 1,265,358 $ 1,178,489
Reconciliation of Total Amounts of Unrecognized Tax Benefits	Unrecognized Tax Benefits March 31, 2022 2021 (In thousands) Unrecognized tax benefits beginning balance $ 31,069 $ 29,632 Revaluation based on change in after tax benefit – – Additions based on tax positions related to the current year 8,257 1,479 Reductions for tax positions of prior years – (42) Additions for tax provisions of prior years 9,525 – Unrecognized tax benefits ending balance$ 48,851 $ 31,069

Employee Benefit Plans (Table Text Block)	12 Months Ended
Employee Benefit Plans (Table Text Block)	Mar. 31, 2022
Table Text Block [Abstract]
Summary Of Financing Arrangements for Leveraged ESOP Debt	Outstanding as of Interest Payments Financing Date March 31, 2022 2022 2021 2020 (In thousands) July, 2009 – – – 9 February, 2016 – – – 229
Shares Held by the ESOP Plan	Years Ended March 31, 2022 2021 (In thousands) Allocated shares 890 951 Unreleased shares - leveraged – – Fair value of unreleased shares - leveraged $ – $ – Unreleased shares - non-leveraged – – Fair value of unreleased shares - non-leveraged$ – $ –
Components of Net Periodic Post Retirement Benefit Cost	Years Ended March 31, 2022 2021 2020 (In thousands) Service cost for benefits earned during the period $ 1,401 $ 1,267 $ 1,055 Other components of net periodic benefit costs: Interest cost on accumulated postretirement benefit 908 919 964 Other components 212 68 90 Total other components of net periodic benefit costs 1,120 987 1,054 Net periodic postretirement benefit cost$ 2,521 $ 2,254 $ 2,109
Components of Post Retirement Benefit Liabilities	Years Ended March 31, 2022 2021 (In thousands) Beginning of year $ 30,755 $ 27,503 Service cost for benefits earned during the period 1,401 1,267 Interest cost on accumulated post retirement benefit 908 919 Net benefit payments and expense (1,021) (841) Actuarial (gain) loss (1,837) 1,907 Accumulated postretirement benefit obligation 30,206 30,755 Current liabilities 1,449 1,334 Non-current liabilities 28,757 29,421 Total post retirement benefit liability recognized in statement of financial position 30,206 30,755 Components included in accumulated other comprehensive income (loss): Unrecognized net loss (3,237) (5,286) Cumulative net periodic benefit cost (in excess of employer contribution)$ 26,969 $ 25,469
Discount Rate Assumptions for Accumulated Postretirement Benefit Obligations	Years Ended March 31, 2022 2021 2020 (In percentages) Accumulated postretirement benefit obligation 3.76 % 2.93 % 3.37 %
Future Net Benefit Payments Expected for Post Employee Benefit Obligations	Future Net Benefit Payments (In thousands) Year-ended: 2023 $ 1,369 2024 1,536 2025 1,733 2026 1,950 2027 2,170 2028 Through 2032 12,112 Total$ 20,870

Fair Value Measurements (Table Text Block)	12 Months Ended
Fair Value Measurements (Table Text Block)	Mar. 31, 2022	Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Financial Instruments, Carrying and Estimated fair values	Fair Value Hierarchy As of March 31, 2022 Carrying Value Level 1 Level 2 Level 3 Total Estimated Fair Value (In thousands) Assets Reinsurance recoverables and trade receivables, net $ 229,343 $ – $ – $ 229,343 $ 229,343 Mortgage loans, net 423,163 – – 423,163 450,347 Other investments 120,592 – – 120,592 120,592 Total $ 773,098 $ – $ – $ 773,098 $ 800,282 Liabilities Notes, loans and finance leases payable $ 6,059,713 $ – $ 6,059,713 $ – $ 5,875,781 Total$ 6,059,713 $ – $ 6,059,713 $ – $ 5,875,781	. Fair Value Hierarchy As of March 31, 2021 Carrying Value Level 1 Level 2 Level 3 Total Estimated Fair Value (In thousands) Assets Reinsurance recoverables and trade receivables, net $ 224,426 $ – $ – $ 224,426 $ 224,426 Mortgage loans, net 391,230 – – 391,230 391,230 Other investments 98,529 – – 98,529 98,529 Total $ 714,185 $ – $ – $ 714,185 $ 714,185 Liabilities Notes, loans and finance leases payable $ 4,698,615 – $ 4,698,615 $ – $ 4,449,691 Total$ 4,698,615 $ – $ 4,698,615 $ – $ 4,449,691
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis	As of March 31, 2022 Total Level 1 Level 2 Level 3 (In thousands) Assets Short-term investments $ 2,482,154 $ 2,482,154 $ – $ – Fixed maturities - available for sale 2,821,092 26,914 2,794,086 92 Preferred stock 26,095 26,095 – – Common stock 46,212 46,212 – – Derivatives 7,474 7,474 – – Total $ 5,383,027 $ 2,588,849 $ 2,794,086 $ 92 Liabilities Derivatives $ 587 $ – $ 587 $ – Total$ 587 $ – $ 587 $ –	As of March 31, 2021 Total Level 1 Level 2 Level 3 (In thousands) Assets Short-term investments $ 839,250 $ 839,250 $ – $ – Fixed maturities - available for sale 2,653,539 6,967 2,646,415 157 Preferred stock 21,677 21,677 – – Common stock 20,440 20,440 – – Derivatives 6,601 6,601 – – Total $ 3,541,507 $ 894,935 $ 2,646,415 $ 157 Liabilities Derivatives $ 5,141 $ – $ 5,141 $ – Total$ 5,141 $ – $ 5,141 $ –

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Reinsurance and Policy Benefits and Losses, Claims and Loss Expenses Payable (Table Text Block)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Supplemental Schedule Of Reinsurance Premiums For Insurance Companies [Abstract]
Supplemental Schedule Of Reinsurance Premiums For Insurance Companies [Table Text Block]	Direct Ceded to Assumed Net Percentage of (In thousands) Year ended December 31, 2021 Life insurance in force $ 1,029,537 $ 72 $ 328,030 $ 1,357,495 24 % Premiums earned: Life $ 56,353 $ 2 $ 4,514 $ 60,865 7 % Accident and health 48,385 160 1,166 49,391 2 % Annuity 444 – 327 771 42 % Property and casualty 89,667 – – 89,667 – % Total $ 194,849 $ 162 $ 6,007 $ 200,694 Year ended December 31, 2020 Life insurance in force $ 1,031,634 $ 73 $ 356,266 $ 1,387,827 26 % Premiums earned: Life $ 58,048 $ 1 $ 5,049 $ 63,096 8 % Accident and health 57,081 211 1,388 58,258 2 % Annuity 221 – 34 255 13 % Property and casualty 70,285 – – 70,285 – % Total $ 185,635 $ 212 $ 6,471 $ 191,894 Year ended December 31, 2019 Life insurance in force $ 957,280 $ 7 $ 441,563 $ 1,398,836 32 % Premiums earned: Life $ 53,289 $ 1 $ 5,629 $ 58,917 10 % Accident and health 66,863 226 1,563 68,200 2 % Annuity 65 – 794 859 92 % Property and casualty 69,126 – 15 69,141 – % Total$ 189,343 $ 227 $ 8,001 $ 197,117
Schedule of Effect of Reinsurance [Table Text Block]	December 31, 2021 2020 (In thousands) Unpaid losses and loss adjustment expense $ 159,162 $ 177,963 Reinsurance losses payable 1,217 979 Total $ 160,379 $ 178,942
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]	December 31, 2021 2020 2019 (In thousands) Balance at January 1 $ 177,963 $ 209,127 $ 228,970 Less: reinsurance recoverable 64,873 87,083 94,920 Net balance at January 1 113,090 122,044 134,050 Incurred related to: Current year 28,980 20,670 22,137 Prior years (6,290) (3,865) (9,535) Total incurred 22,690 16,805 12,602 Paid related to: Current year 11,040 7,664 7,366 Prior years 12,972 18,095 17,242 Total paid 24,012 25,759 24,608 Net balance at December 31 111,768 113,090 122,044 Plus: reinsurance recoverable 47,394 64,873 87,083 Balance at December 31$ 159,162 $ 177,963 $ 209,127
Shortduration Insurance Contracts Claims Development [Table Text Block]	Cumulative Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance As of December 31, 2021 Total of Incurred-but- Not-Reported Liabilities Plus Expected Cumulative Development Number of Accident on Reported Reported Year 2015 2016 2017 2018 2019 2020 2021 Claims Claims (In thousands, except claim counts) 2015 $ 12,214 $ 12,459 $ 12,460 $ 12,464 $ 11,087 $ 11,092 $ 11,093 $ – 11,104 2016 13,297 13,011 13,056 11,790 11,764 11,764 – 11,469 2017 15,748 16,109 17,078 15,538 15,273 – 12,102 2018 19,580 18,386 18,027 17,157 251 11,983 2019 22,138 26,316 27,316 2,283 11,746 2020 20,671 17,485 3,455 11,274 2021 28,982 12,709 13,729 Total 18,698
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Table Text Block]	Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (In thousands) Accident Year 2015 2016 2017 2018 2019 2020 2021 2015 $ 7,509 $ 9,601 $ 9,730 $ 10,343 $ 11,087 $ 11,092 $ 11,093 2016 7,777 10,665 11,643 11,746 11,764 11,764 2017 8,970 11,638 14,825 15,012 15,263 2018 8,838 12,689 15,150 16,766 2019 7,366 14,737 19,215 2020 7,665 11,114 2021 11,040 Total Total 96,255 All outstanding liabilities before 2015, net of reinsurance 78,955 Liabilities for claims and claim adjustment expenses, net of reinsurance 111,768	December 31, 2021 (In thousands) Liabilities for unpaid Property and Casualty claims and claim adjustment expenses, net of reinsurance $ 111,768 Total reinsurance recoverable on unpaid Property and Casualty claims $ 47,394 Total gross liability for unpaid Property and Casualty claims and claim adjustment expense$ 159,162
Shortduration Insurance Contracts Schedule Of Historical Claims Duration [Table Text Block]	Average Annual Percentage Payout of Incurred Claims by Age, net of Reinsurance (In percentages) Years 1 2 3 4 5 6 7 Property and Casualty Insurance 50.4 % 21.7 % 12.2 % 4.3 % 2.8 % – % – %

Leases (Table Text Block)	12 Months Ended
Leases (Table Text Block)	Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Supplemental Balance Sheet Information Related to Leases	As of March 31, 2022 Finance Operating Total (In thousands) Buildings and improvements $ – $ 136,444 $ 136,444 Furniture and equipment 14,731 – 14,731 Rental trailers and other rental equipment 169,514 – 169,514 Rental trucks 1,114,248 – 1,114,248 Right-of-use assets, gross 1,298,493 136,444 1,434,937 Less: Accumulated depreciation (677,669) (62,062) (739,731) Right-of-use assets, net$ 620,824 $ 74,382 $ 695,206	As of March 31, 2021 Finance Operating Total (In thousands) Buildings and improvements $ – $ 132,901 $ 132,901 Furniture and equipment 22,316 – 22,316 Rental trailers and other rental equipment 203,594 – 203,594 Rental trucks 1,494,098 – 1,494,098 Right-of-use assets, gross 1,720,008 132,901 1,852,909 Less: Accumulated depreciation (842,970) (40,396) (883,366) Right-of-use assets, net$ 877,038 $ 92,505 $ 969,543
Summary of Weighted-average remaining lease terms and Discount rates	Financing leases March 31, 2022 2021 Weighted average remaining lease term (years) 3 3 Weighted average discount rate 3.7 % 3.6 %	Operating leases March 31, 2022 2021 Weighted average remaining lease term (years) 16.5 14.7 Weighted average discount rate 4.6 % 4.6 %
Lease costs	Twelve Months Ended March 31, 2022 2021 (In thousands) Operating lease costs $ 30,239 $ 30,551 Finance lease cost: Amortization of right-of-use assets $ 115,199 $ 150,994 Interest on lease liabilities 15,289 22,405 Total finance lease cost$ 130,488 $ 173,399
Maturities of Lease Liabilities	Finance leases Operating leases Year ending March 31, (In thousands) 2023 $ 133,577 $ 23,311 2024 111,781 21,903 2025 78,280 10,630 2026 47,064 4,162 2027 – 3,061 Thereafter – 59,348 Total lease payments 370,702 122,415 Less: imputed interest (23,309) (48,218) Present value of lease liabilities$ 347,393 $ 74,197

Related Party Transactions (Table Text Block)	12 Months Ended
Related Party Transactions (Table Text Block)	Mar. 31, 2022
Related Party Revenue [Abstract]
Related Party Revenue	Years Ended March 31, 2022 2021 2020 (In thousands) U-Haul management fee revenue from Blackwater $ 28,546 $ 25,512 $ 24,014 U-Haul management fee revenue from Mercury 6,648 6,091 6,392 $ 35,194 $ 31,603 $ 30,406
Related Party Cost and Expense	Years Ended March 31, 2022 2021 2020 (In thousands) U-Haul lease expenses to Blackwater $ 2,445 $ 2,612 $ 2,631 U-Haul commission expenses to Blackwater 88,288 69,212 62,066 $ 90,733 $ 71,824 $ 64,697
Due from Related Party, Recap of Assets	March 31, 2022 2021 (In thousands) U-Haul receivable from Blackwater $ 41,364 $ 27,116 U-Haul receivable from Mercury 5,708 9,632 Other (a) 779 (1,353) $ 47,851 $ 35,395

Statutory Financial Information of Insurance Subsidiaries (Table Text Block)	12 Months Ended
	Mar. 31, 2022
Insurance [Abstract]
Statutory Financial Information of Insurance Subsidiaries	Years Ended December 31, 2021 2020 2019 (In thousands) Repwest: Audited statutory net income $ 33,314 $ 22,898 $ 28,614 Audited statutory capital and surplus 266,875 227,380 226,999 ARCOA: Audited statutory net income (loss) (752) 2,438 2,906 Audited statutory capital and surplus 14,697 15,928 12,851 Oxford: Audited statutory net income 23,217 6,296 18,599 Audited statutory capital and surplus 230,202 218,301 223,264 CFLIC: Audited statutory net income 6,019 8,082 8,043 Audited statutory capital and surplus 17,098 25,980 26,305 NAI: Audited statutory net income 1,874 2,127 1,942 Audited statutory capital and surplus 7,961 13,980 13,371

- Definition

Tabular disclosure of how the entity's reporting under GAAP as of the balance sheet date differs from the results based on prescribed and permitted accounting practices of the state or country of domicile in which a relevant statutory filing is made, or differences in results based on the National Association of Insurance Commissioners (NAIC) prescribed practices, or a combination thereof. Describes the accounting practices used and the related monetary effect on statutory surplus, net income, and risk-based capital. If an insurance enterprise's risk-based capital would have triggered a regulatory event had it not used a permitted practice, that fact is disclosed in the financial statements. Permitted statutory accounting practices include practices not prescribed but allowed by the domiciliary state insurance department regulatory authority.

+ References + Details

Financial Information by Geographic Area (Table Text Block)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Geographic Areas, Long-Lived Assets [Abstract]
Industry Segment and Geographic Area Data	United States Canada Consolidated (All amounts are in thousands U.S. $'s) Fiscal Year Ended March 31, 2022 Total revenues $ 5,452,027 $ 287,720 $ 5,739,747 Depreciation and amortization, net of gains on disposal 509,517 2,969 512,486 Interest expense 163,586 3,838 167,424 Pretax earnings 1,431,155 44,342 1,475,497 Income tax expense 342,213 9,998 352,211 Identifiable assets 16,776,070 523,511 17,299,581	United States Canada Consolidated (All amounts are in thousands U.S. $'s) Fiscal Year Ended March 31, 2021 Total revenues $ 4,334,083 $ 207,902 $ 4,541,985 Depreciation and amortization, net of gains on disposal 631,344 10,160 641,504 Interest expense 160,429 3,073 163,502 Pretax earnings 773,030 23,628 796,658 Income tax expense 180,845 4,957 185,802 Identifiable assets 14,212,978 438,628 14,651,606	United States Canada Consolidated (All amounts are in thousands U.S. $'s) Fiscal Year Ended March 31, 2020 Total revenues $ 3,797,849 $ 181,019 $ 3,978,868 Depreciation and amortization, net of gains on disposal 652,110 15,414 667,524 Interest expense 157,595 3,355 160,950 Pretax earnings 372,687 5,437 378,124 Income tax expense (benefit) (65,842) 1,918 (63,924) Identifiable assets 13,016,942 421,082 13,438,024

Consolidating Financial Information by Industry Segment (Table Text Block)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Table Text Block Supplement [Abstract]
Consolidated Balance Sheet by Industry Segment	Consolidating balance sheets by industry segment as of March 31, 2022 are as follows: Moving & Storage Consolidated Property & Casualty Insurance (a) Life Insurance (a) Eliminations AMERCO Consolidated (In thousands) Assets: Cash and cash equivalents $ 2,643,213 $ 10,800 $ 50,124 $ – $ 2,704,137 Reinsurance recoverables and trade receivables, net 142,895 50,235 36,213 – 229,343 Inventories and parts, net 158,888 – – – 158,888 Prepaid expenses 236,915 – – – 236,915 Investments, fixed maturities and marketable equities – 297,488 2,595,911 – 2,893,399 Investments, other 20,653 114,269 408,833 – 543,755 Deferred policy acquisition costs, net – – 103,828 – 103,828 Other assets 57,305 371 2,733 – 60,409 Right of use assets - financing, net 620,824 – – – 620,824 Right of use assets - operating, net 74,190 93 99 – 74,382 Related party assets 64,611 6,713 16,911 (40,384) (c) 47,851 4,019,494 479,969 3,214,652 (40,384) 7,673,731 Investment in subsidiaries 737,073 – – (737,073) (b) – Property, plant and equipment, at cost: Land 1,283,142 – – – 1,283,142 Buildings and improvements 5,974,639 – – – 5,974,639 Furniture and equipment 846,132 – – – 846,132 Rental trailers and other rental equipment 615,679 – – – 615,679 Rental trucks 4,638,814 – – – 4,638,814 13,358,406 – – – 13,358,406 Less: Accumulated depreciation (3,732,556) – – – (3,732,556) Total property, plant and equipment, net 9,625,850 – – – 9,625,850 Total assets $ 14,382,417 $ 479,969 $ 3,214,652 $ (777,457) $ 17,299,581 (a) Balances as of December 31, 2021 (b) Eliminate investment in subsidiaries (c) Eliminate intercompany receivables and payables Consolidating balance sheets by industry segment as of March 31, 2022 are as follows: Moving & Storage Property & Casualty Insurance (a) Life Eliminations AMERCO (In thousands) Liabilities: Accounts payable and accrued expenses $ 663,482 $ 3,849 $ 10,454 $ – $ 677,785 Notes, loans and finance leases payable, net 6,022,497 – – – 6,022,497 Operating lease liability 73,998 93 106 – 74,197 Policy benefits and losses, claims and loss expenses payable 418,890 160,379 398,985 – 978,254 Liabilities from investment contracts – – 2,336,238 – 2,336,238 Other policyholders' funds and liabilities – 3,521 7,291 – 10,812 Deferred income 49,157 – – – 49,157 Deferred income taxes, net 1,244,639 12,803 7,916 – 1,265,358 Related party liabilities 25,668 3,196 12,717 (41,581) (c) – Total liabilities 8,498,331 183,841 2,773,707 (41,581) 11,414,298 Stockholders' equity : Series preferred stock: Series A preferred stock – – – – – Series B preferred stock – – – – – Series A common stock – – – – – Common stock 10,497 3,301 2,500 (5,801) (b) 10,497 Additional paid-in capital 454,029 91,120 26,271 (117,601) (b) 453,819 Accumulated other comprehensive income (loss) 45,187 16,630 87,200 (102,633) (b) 46,384 Retained earnings 6,052,023 185,077 324,974 (509,841) (b) 6,052,233 Cost of common shares in treasury, net (525,653) – – – (525,653) Cost of preferred shares in treasury, net (151,997) – – – (151,997) Total stockholders' equity 5,884,086 296,128 440,945 (735,876) 5,885,283 Total liabilities and stockholders' equity $ 14,382,417 $ 479,969 $ 3,214,652 $ (777,457) $ 17,299,581 (a) Balances as of December 31, 2021 (b) Eliminate investment in subsidiaries (c) Eliminate intercompany receivables and payables	Consolidating balance sheets by industry segment as of March 31, 2021 are as follows: Moving & Storage Consolidated Property & Casualty Insurance (a) Life Insurance (a) Eliminations AMERCO Consolidated (In thousands) Assets: Cash and cash equivalents $ 1,010,275 $ 5,658 $ 178,079 $ – $ 1,194,012 Reinsurance recoverables and trade receivables, net 118,741 67,069 38,616 – 224,426 Inventories and parts, net 105,577 – – – 105,577 Prepaid expenses 469,144 – – – 469,144 Investments, fixed maturities and marketable equities – 295,753 2,399,903 – 2,695,656 Investments, other 20,733 90,412 378,614 – 489,759 Deferred policy acquisition costs, net – – 89,749 – 89,749 Other assets 44,763 436 2,531 – 47,730 Right of use assets - financing, net 877,038 – – – 877,038 Right of use assets - operating, net 92,245 92 168 – 92,505 Related party assets 54,042 6,854 13,850 (39,351) (c) 35,395 2,792,558 466,274 3,101,510 (39,351) 6,320,991 Investment in subsidiaries 741,860 – – (741,860) (b) – Property, plant and equipment, at cost: Land 1,075,813 – – – 1,075,813 Buildings and improvements 5,163,705 – – – 5,163,705 Furniture and equipment 786,505 – – – 786,505 Rental trailers and other rental equipment 477,921 – – – 477,921 Rental trucks 3,909,724 – – – 3,909,724 11,413,668 – – – 11,413,668 Less: Accumulated depreciation (3,083,053) – – – (3,083,053) Total property, plant and equipment, net 8,330,615 – – – 8,330,615 Total assets $ 11,865,033 $ 466,274 $ 3,101,510 $ (781,211) $ 14,651,606 (a) Balances as of December 31, 2020 (b) Eliminate investment in subsidiaries (c) Eliminate intercompany receivables and payables Consolidating balance sheets by industry segment as of March 31, 2021 are as follows: Moving & Storage Property & Casualty Insurance (a) Life Eliminations AMERCO (In thousands) Liabilities: Accounts payable and accrued expenses $ 636,257 $ 2,029 $ 7,289 $ – $ 645,575 Notes, loans and leases payable, net 4,657,720 – 11,187 – 4,668,907 Operating lease liability 92,236 96 178 – 92,510 Policy benefits and losses, claims and loss expenses payable 427,073 178,942 391,686 – 997,701 Liabilities from investment contracts – – 2,161,530 – 2,161,530 Other policyholders' funds and liabilities – 3,698 8,722 – 12,420 Deferred income 42,592 – – – 42,592 Deferred income taxes, net 1,136,149 13,046 29,294 – 1,178,489 Related party liabilities 25,413 5,821 12,406 (43,640) (c) – Total liabilities 7,017,440 203,632 2,622,292 (43,640) 9,799,724 Stockholders' equity : Series preferred stock: Series A preferred stock – – – – – Series B preferred stock – – – – – Series A common stock – – – – – Common stock 10,497 3,301 2,500 (5,801) (b) 10,497 Additional paid-in capital 454,029 91,120 26,271 (117,601) (b) 453,819 Accumulated other comprehensive income (loss) 102,568 22,546 140,817 (159,074) (b) 106,857 Retained earnings 4,958,149 145,675 309,630 (455,095) (b) 4,958,359 Cost of common shares in treasury, net (525,653) – – – (525,653) Cost of preferred shares in treasury, net (151,997) – – – (151,997) Total stockholders' equity $ 4,847,593 262,642 479,218 (737,571) 4,851,882 Total liabilities and stockholders' equity 11,865,033 $ 466,274 $ 3,101,510 $ (781,211) $ 14,651,606 (a) Balances as of December 31, 2020 (b) Eliminate investment in subsidiaries (c) Eliminate intercompany receivables and payables
Consolidated Statement of Operations by Industry Segment	Consolidating statements of operations by industry segment for period ending March 31, 2022 are as follows: Moving & Storage Property & Casualty Insurance (a) Life Eliminations AMERCO (In thousands) Revenues: Self-moving equipment rentals $ 3,963,535 $ – $ – $ (4,728) (c) $ 3,958,807 Self-storage revenues 617,120 – – – 617,120 Self-moving & self-storage products & service sales 351,447 – – – 351,447 Property management fees 35,194 – – – 35,194 Life insurance premiums – – 111,027 – 111,027 Property and casualty insurance premiums – 89,667 – (3,149) (c) 86,518 Net investment and interest income 3,135 25,376 123,809 (4,059) (b) 148,261 Other revenue 427,836 – 3,976 (439) (b) 431,373 Total revenues 5,398,267 115,043 238,812 (12,375) 5,739,747 Costs and expenses: Operating expenses 2,621,270 42,456 21,112 (8,297) (b,c) 2,676,541 Commission expenses 429,581 – – – 429,581 Cost of sales 259,585 – – – 259,585 Benefits and losses – 22,448 164,199 – 186,647 Amortization of deferred policy acquisition costs – – 33,854 – 33,854 Lease expense 31,973 359 109 (2,531) (b) 29,910 Depreciation, net gains on disposals 482,752 – – – 482,752 Net gains on disposal of real estate (4,120) – – – (4,120) Total costs and expenses 3,821,041 65,263 219,274 (10,828) 4,094,750 Earnings from operations before equity in earnings of subsidiaries 1,577,226 49,780 19,538 (1,547) 1,644,997 Equity in earnings of subsidiaries 54,746 – – (54,746) (d) – Earnings from operations 1,631,972 49,780 19,538 (56,293) 1,644,997 Other components of net periodic benefit costs (1,120) – – – (1,120) Interest expense (168,491) – (480) 1,547 (b) (167,424) Fees on early extinguishment of debt (956) – – – (956) Pretax earnings 1,461,405 49,780 19,058 (54,746) 1,475,497 Income tax expense (338,119) (10,378) (3,714) – (352,211) Earnings available to common shareholders $ 1,123,286 $ 39,402 $ 15,344 $ (54,746) $ 1,123,286 (a) Balances for the year ended December 31, 2021 (b) Eliminate intercompany lease / interest income (c) Eliminate intercompany premiums (d) Eliminate equity in earnings of subsidiaries	Consolidating statements of operations by industry segment for period ending March 31, 2021 are as follows: Moving & Storage Property & Casualty Insurance (a) Life Eliminations AMERCO (In thousands) Revenues: Self-moving equipment rentals $ 3,086,824 $ – $ – $ (3,507) (c) $ 3,083,317 Self-storage revenues 477,262 – – – 477,262 Self-moving & self-storage products & service sales 344,929 – – – 344,929 Property management fees 31,603 – – – 31,603 Life insurance premiums – – 121,609 – 121,609 Property and casualty insurance premiums – 70,285 – (1,506) (c) 68,779 Net investment and interest income 2,259 16,452 107,745 (3,518) (b) 122,938 Other revenue 288,797 – 3,280 (529) (b) 291,548 Total revenues 4,231,674 86,737 232,634 (9,060) 4,541,985 Costs and expenses: Operating expenses 2,137,381 35,450 20,376 (5,523) (b,c) 2,187,684 Commission expenses 329,609 – – – 329,609 Cost of sales 214,059 – – – 214,059 Benefits and losses – 18,558 160,954 – 179,512 Amortization of deferred policy acquisition costs – – 28,293 – 28,293 Lease expense 30,551 231 135 (2,447) (b) 28,470 Depreciation, net gains on disposals 609,930 – – – 609,930 Net losses on disposal of real estate 3,281 – – – 3,281 Total costs and expenses 3,324,811 54,239 209,758 (7,970) 3,580,838 Earnings from operations before equity in earnings of subsidiaries 906,863 32,498 22,876 (1,090) 961,147 Equity in earnings of subsidiaries 44,441 – – (44,441) (d) – Earnings from operations 951,304 32,498 22,876 (45,531) 961,147 Other components of net periodic benefit costs (987) – – – (987) Interest expense (164,592) – – 1,090 (b) (163,502) Pretax earnings 785,725 32,498 22,876 (44,441) 796,658 Income tax expense (174,869) (6,778) (4,155) – (185,802) Earnings available to common shareholders $ 610,856 $ 25,720 $ 18,721 $ (44,441) $ 610,856 (a) Balances for the year ended December 31, 2020 (b) Eliminate intercompany lease/interest income (c) Eliminate intercompany premiums (d) Eliminate equity in earnings of subsidiaries	Consolidating statements of operations by industry segment for period ending March 31, 2020 are as follows: Moving & Storage Property & Casualty Insurance (a) Life Eliminations AMERCO (In thousands) Revenues: Self-moving equipment rentals $ 2,696,516 $ – $ – $ (4,103) (c) $ 2,692,413 Self-storage revenues 418,741 – – – 418,741 Self-moving & self-storage products & service sales 265,091 – – – 265,091 Property management fees 30,406 – – – 30,406 Life insurance premiums – – 127,976 – 127,976 Property and casualty insurance premiums – 69,141 – (3,088) (c) 66,053 Net investment and interest income 10,593 19,923 109,018 (1,705) (b) 137,829 Other revenue 236,419 – 4,470 (530) (b) 240,359 Total revenues 3,657,766 89,064 241,464 (9,426) 3,978,868 Costs and expenses: Operating expenses 2,069,655 33,770 21,425 (7,702) (b,c) 2,117,148 Commission expenses 288,332 – – – 288,332 Cost of sales 164,018 – – – 164,018 Benefits and losses – 12,410 162,426 – 174,836 Amortization of deferred policy acquisition costs – – 31,219 – 31,219 Lease expense 27,494 – – (612) (b) 26,882 Depreciation, net gains on disposals 637,063 – – – 637,063 Net gains on disposal of real estate (758) – – – (758) Total costs and expenses 3,185,804 46,180 215,070 (8,314) 3,438,740 Earnings from operations before equity in earnings of subsidiaries 471,962 42,884 26,394 (1,112) 540,128 Equity in earnings of subsidiaries 55,789 – – (55,789) (d) – Earnings from operations 527,751 42,884 26,394 (56,901) 540,128 Other components of net periodic benefit costs (1,054) – – – (1,054) Interest expense (162,062) – – 1,112 (b) (160,950) Pretax earnings 364,635 42,884 26,394 (55,789) 378,124 Income tax benefit (expense) 77,413 (8,956) (4,533) – 63,924 Earnings available to common shareholders $ 442,048 $ 33,928 $ 21,861 $ (55,789) $ 442,048 (a) Balances for the year ended December 31, 2019 (b) Eliminate intercompany lease/interest income (c) Eliminate intercompany premiums (d) Eliminate equity in earnings of subsidiaries
Consolidated Cash Flow Statement by Industry Segment	Consolidating cash flow statements by industry segment for the year ended March 31, 2022, are as follows: Moving & Storage Consolidated Property & Casualty Insurance (a) Life Insurance (a) Elimination AMERCO Consolidated (In thousands) Cash flows from operating activities: Net earnings $ 1,123,286 $ 39,402 $ 15,344 $ (54,746) $ 1,123,286 Earnings from consolidated subsidiaries (54,746) – – 54,746 – Adjustments to reconcile net earnings to cash provided by operations: Depreciation 696,955 – – – 696,955 Amortization of deferred policy acquisition costs – – 33,854 – 33,854 Amortization of premiums and accretion of discounts related to investments, net – 1,638 18,111 – 19,749 Amortization of debt issuance costs 5,659 – – – 5,659 Interest credited to policyholders – – 64,692 – 64,692 Change in allowance for losses on trade receivables 4,689 (456) (6) – 4,227 Change in allowance for inventories and parts reserve 15,235 – – – 15,235 Net gains on disposal of personal property (214,203) – – – (214,203) Net gains on disposal of real estate (4,120) – – – (4,120) Net gains on sales of investments – (991) (10,881) – (11,872) Net gains on equity securities – (7,837) – – (7,837) Deferred income taxes 106,869 1,347 (7,125) – 101,091 Net change in other operating assets and liabilities: Reinsurance recoverables and trade receivables (28,776) 17,180 2,409 – (9,187) Inventories and parts (68,536) – – – (68,536) Prepaid expenses 232,342 – – – 232,342 Capitalization of deferred policy acquisition costs – – (32,626) – (32,626) Other assets (2,919) 346 (133) – (2,706) Related party assets (10,517) 160 – – (10,357) Accounts payable and accrued expenses 23,839 1,821 3,092 – 28,752 Policy benefits and losses, claims and loss expenses payable (8,428) (18,563) 7,299 – (19,692) Other policyholders' funds and liabilities – (177) (1,431) – (1,608) Deferred income 6,368 – (1,152) – 5,216 Related party liabilities 255 (2,644) 310 – (2,079) Net cash provided by operating activities 1,823,252 31,226 91,757 – 1,946,235 Cash flows from investing activities: Escrow deposits (9,328) – – – (9,328) Purchases of: Property, plant and equipment (2,136,537) – – – (2,136,537) Short term investments – (74,418) – – (74,418) Fixed maturities investments – (10,248) (617,078) – (627,326) Equity securities – (17,919) (1,380) – (19,299) Preferred stock – – (8,000) – (8,000) Real estate (33) (59) (169) – (261) Mortgage loans – (24,032) (134,115) – (158,147) Proceeds from sales and paydowns of: Property, plant and equipment 623,235 – – – 623,235 Short term investments – 50,737 854 – 51,591 Fixed maturities investments – 24,201 336,736 – 360,937 Equity securities – 20 2,026 – 2,046 Preferred stock – 2,000 – – 2,000 Real estate 113 – – – 113 Mortgage loans – 23,634 102,584 – 126,218 Net cash used by investing activities (1,522,550) (26,084) (318,542) – (1,867,176) (page 1 of 2) (a) Balance for the period ended December 31, 2021 Continuation of consolidating cash flow statements by industry segment for the year ended March 31, 2022, are as follows: Moving & Storage Consolidated Property & Casualty Life Elimination AMERCO (In thousands) Cash flows from financing activities: Borrowings from credit facilities 1,969,474 – – – 1,969,474 Principal repayments on credit facilities (426,319) – (11,187) – (437,506) Payment of debt issuance costs (13,156) – – – (13,156) Finance lease payments (166,262) – – – (166,262) Common stock dividends paid (29,412) – – – (29,412) Investment contract deposits – – 347,520 – 347,520 Investment contract withdrawals – – (237,503) – (237,503) Net cash provided by financing activities 1,334,325 – 98,830 – 1,433,155 Effects of exchange rate on cash (2,089) – – – (2,089) Increase (decrease) in cash and cash equivalents 1,632,938 5,142 (127,955) – 1,510,125 Cash and cash equivalents at beginning of period 1,010,275 5,658 178,079 – 1,194,012 Cash and cash equivalents at end of period $ 2,643,213 $ 10,800 $ 50,124 $ – $ 2,704,137 (page 2 of 2) (a) Balance for the period ended December 31, 2021	Consolidating cash flow statements by industry segment for the year ended March 31, 2021, are as follows: Moving & Storage Consolidated Property & Casualty Insurance (a) Life Insurance (a) Elimination AMERCO Consolidated (In thousands) Cash flows from operating activities: Net earnings $ 610,856 $ 25,720 $ 18,721 $ (44,441) $ 610,856 Earnings from consolidated subsidiaries (44,441) – – 44,441 – Adjustments to reconcile net earnings to cash provided by operations: Depreciation 664,001 – – – 664,001 Amortization of deferred policy acquisition costs – – 28,293 – 28,293 Amortization of premiums and accretion of discounts related to investments, net – 1,578 12,651 – 14,229 Amortization of debt issuance costs 5,948 – – – 5,948 Interest credited to policyholders – – 55,321 – 55,321 Change in allowance for losses on trade receivables 1,424 (217) (1) – 1,206 Change in allowance for inventories and parts reserve 1,298 – – – 1,298 Net gains on disposal of personal property (54,071) – – – (54,071) Net losses on disposal of real estate 3,281 – – – 3,281 Net gains on sales of investments – (158) (9,900) – (10,058) Net gains on equity securities – (394) – – (394) Deferred income taxes 72,407 459 (4,455) – 68,411 Net change in other operating assets and liabilities: Reinsurance recoverables and trade receivables (60,806) 27,302 (6,012) – (39,516) Inventories and parts (5,775) – – – (5,775) Prepaid expenses 94,359 – – – 94,359 Capitalization of deferred policy acquisition costs – – (36,162) – (36,162) Other assets 29,879 537 (551) – 29,865 Related party assets (12,790) 303 – 12,000 (b) (487) Accounts payable and accrued expenses 96,309 (3,497) 113 – 92,925 Policy benefits and losses, claims and loss expenses payable 14,919 (31,398) 14,487 – (1,992) Other policyholders' funds and liabilities – (2,053) 4,283 – 2,230 Deferred income 10,959 – 608 – 11,567 Related party liabilities 1,136 1,187 9,737 (12,000) (b) 60 Net cash provided by operating activities 1,428,893 19,369 87,133 – 1,535,395 Cash flows from investing activities: Escrow deposits (5,221) – – – (5,221) Purchases of: Property, plant and equipment (1,441,475) – – – (1,441,475) Short term investments – (69,929) – – (69,929) Fixed maturities investments – (18,823) (587,410) – (606,233) Equity securities – – (962) – (962) Preferred stock – – (16,144) – (16,144) Real estate – – (622) – (622) Mortgage loans – (18,035) (140,036) – (158,071) Proceeds from sales and paydowns of: Property, plant and equipment 537,484 – – – 537,484 Short term investments – 69,669 49 – 69,718 Fixed maturities investments – 20,854 508,385 – 529,239 Equity securities – – 207 – 207 Preferred stock – 2,700 – – 2,700 Real estate 255 – – – 255 Mortgage loans – 17,659 11,866 – 29,525 Net cash (used) provided by investing activities (908,957) 4,095 (224,667) – (1,129,529) (page 1 of 2) (a) Balance for the period ended December 31, 2020 Continuation of consolidating cash flow statements by industry segment for the year ended March 31, 2021, are as follows: Moving & Storage Consolidated Property & Casualty Life Elimination AMERCO (In thousands) Cash flows from financing activities: Borrowings from credit facilities 912,408 – 9,600 – 922,008 Principal repayments on credit facilities (652,728) – (9,860) – (662,588) Payment of debt issuance costs (5,793) – – – (5,793) Finance lease payments (221,247) – – – (221,247) Common stock dividends paid (49,019) – – – (49,019) Net contribution from (to) related party 41,199 (22,600) (18,599) – – Investment contract deposits – – 517,856 – 517,856 Investment contract withdrawals – – (213,864) – (213,864) Net cash provided (used) by financing activities 24,820 (22,600) 285,133 – 287,353 Effects of exchange rate on cash 6,441 – – – 6,441 Increase in cash and cash equivalents 551,197 864 147,599 – 699,660 Cash and cash equivalents at beginning of period 459,078 4,794 30,480 – 494,352 Cash and cash equivalents at end of period $ 1,010,275 $ 5,658 $ 178,079 $ – $ 1,194,012 (page 2 of 2) (a) Balance for the period ended December 31, 2020	Consolidating cash flow statements by industry segment for the year ended March 31, 2020 are as follows: Moving & Storage Consolidated Property & Casualty Insurance (a) Life Insurance (a) Elimination AMERCO Consolidated (In thousands) Cash flows from operating activities: Net earnings $ 442,048 $ 33,928 $ 21,861 $ (55,789) $ 442,048 Earnings from consolidated subsidiaries (55,789) – – 55,789 – Adjustments to reconcile net earnings to cash provided by operations: Depreciation 664,120 – – – 664,120 Amortization of deferred policy acquisition costs – – 31,219 – 31,219 Amortization of premiums and accretion of discounts related to investments, net – 1,469 11,848 – 13,317 Amortization of debt issuance costs 4,426 – – – 4,426 Interest credited to policyholders – – 51,857 – 51,857 Change in allowance for losses on trade receivables (14) – – – (14) Change in allowance for inventories and parts reserve 640 – – – 640 Net gains on disposal of personal property (27,057) – – – (27,057) Net gains on disposal of real estate (758) – – – (758) Net gains on sales of investments – (355) (13,241) – (13,596) Net gains on equity securities – (3,783) – – (3,783) Deferred income taxes 323,980 (2,847) (3,240) – 317,893 Net change in other operating assets and liabilities: Reinsurance recoverables and trade receivables 30,771 8,127 (769) – 38,129 Inventories and parts 1,776 – – – 1,776 Prepaid expenses (391,120) – – – (391,120) Capitalization of deferred policy acquisition costs – – (24,447) – (24,447) Other assets (3,099) 2,098 (294) – (1,295) Related party assets (5,106) (539) – – (5,645) Accounts payable and accrued expenses (4,428) 2,688 (2,790) – (4,530) Policy benefits and losses, claims and loss expenses payable 3,092 (19,618) 3,908 – (12,618) Other policyholders' funds and liabilities – 491 (5,348) – (4,857) Deferred income (1,818) – – – (1,818) Related party liabilities (1,170) 819 1,977 – 1,626 Net cash provided by operating activities 980,494 22,478 72,541 – 1,075,513 Cash flows from investing activities: Escrow deposits 6,617 – – – 6,617 Purchases of: Property, plant and equipment (2,309,406) – – – (2,309,406) Short term investments – (60,590) (636) – (61,226) Fixed maturities investments – (13,001) (366,348) – (379,349) Equity securities – – (83) – (83) Real estate – (328) (3,958) – (4,286) Mortgage loans – (18,050) (43,966) – (62,016) Proceeds from sales and paydowns of: Property, plant and equipment 687,375 – – – 687,375 Short term investments – 59,056 – – 59,056 Fixed maturities investments – 25,386 243,250 – 268,636 Equity securities – 185 – – 185 Preferred stock – 1,375 1,000 – 2,375 Real estate 311 – – – 311 Mortgage loans – 4,126 21,036 – 25,162 Net cash used by investing activities (1,615,103) (1,841) (149,705) – (1,766,649) (page 1 of 2) (a) Balance for the period ended December 31, 2019 Continuation of consolidating cash flow statements by industry segment for the year ended March 31, 2020 are as follows: Moving & Storage Property & Casualty Life Elimination AMERCO (In thousands) Cash flows from financing activities: Borrowings from credit facilities 1,118,912 – 2,500 – 1,121,412 Principal repayments on credit facilities (347,486) – (2,500) – (349,986) Payment of debt issuance costs (5,332) – – – (5,332) Finance lease payments (307,782) – – – (307,782) Employee stock ownership plan shares (206) – – – (206) Common stock dividends paid (29,404) – – – (29,404) Net contribution from (to) related party 21,600 (21,600) – – – Investment contract deposits – – 234,640 – 234,640 Investment contract withdrawals – – (151,022) – (151,022) Net cash provided (used) by financing activities 450,302 (21,600) 83,618 – 512,320 Effects of exchange rate on cash (533) – – – (533) Increase (decrease) in cash and cash equivalents (184,840) (963) 6,454 – (179,349) Cash and cash equivalents at beginning of period 643,918 5,757 24,026 – 673,701 Cash and cash equivalents at end of period $ 459,078 $ 4,794 $ 30,480 $ – $ 494,352 (page 2 of 2) (a) Balance for the period ended December 31, 2019

Revenue Recognition (Table Text Block)	12 Months Ended
Revenue Recognition (Table Text Block)	Mar. 31, 2022
Revenue From Contract With Customer [Abstract]
Lease schedule over next five years and thereafter	Year Ended March 31, 2023 2024 2025 2026 2027 Thereafter (In thousands) Self-moving equipment rentals $ 5,537 $ – $ – $ – $ – $ – Property lease revenues 16,544 11,063 8,180 6,381 5,254 43,931 Total$ 22,081 $ 11,063 $ 8,180 $ 6,381 $ 5,254 $ 43,931
Disaggregation of revenue	Years Ended March 31, 2022 2021 2020 (In thousands) Revenues recognized over time $ 284,401 $ 182,278 $ 147,565 Revenues recognized at a point in time 414,985 396,600 309,804 Total revenues recognized under ASC 606 699,386 578,878 457,369 Revenues recognized under ASC 842 4,690,434 3,644,798 3,182,902 Revenues recognized under ASC 944 201,666 195,371 200,768 Revenues recognized under ASC 320 148,261 122,938 137,829 Total revenues$ 5,739,747 $ 4,541,985 $ 3,978,868

Allowance for Credit Losses (Table Text Block)	12 Months Ended
Allowance for Credit Losses (Table Text Block)	Mar. 31, 2022
Allowance For Credit Loss [Abstract]
Accounts Receivable Allowance For Credit Loss [Table Text Block]	Allowance for Credit Losses Trade Receivables Investments, Fixed Maturities Investments, other Total (In thousands) Balance as of March 31, 2020 $ 3,215 $ 503 $ 501 $ 4,219 Transition adjustment current expected credit losses 1,206 817 – 2,023 Write-offs against allowance – – – – Recoveries – – – – Balance as of March 31, 2021 $ 4,421 $ 1,320 $ 501 $ 6,242 Provision for (reversal of) credit losses 4,228 (1,260) – 2,968 Write-offs against allowance – – – – Recoveries – – – – Balance as of March 31, 2022$ 8,649 $ 60 $ 501 $ 9,210

Principles of Consolidation (Narratives) (Details)	12 Months Ended
Principles of Consolidation (Narratives) (Details)	Mar. 31, 2022
Disclosure of Entity's Reportable Segments [Abstract]
Number of reportable segments	3

Accounting Policies (Narratives) (Details) - USD ($)	12 Months Ended
Accounting Policies (Narratives) (Details) - USD ($)	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Cash, Insured and Uninsured [Abstract]
Cash, FDIC Insured Amount	$ 250,000
Cash, CDIC insured amount	$ 100,000
LIFO Method Related Items [Abstract]
Percentage of LIFO inventory	93.00%	96.00%
Inventory, LIFO reserve	$ 37,400,000	$ 21,832,000
Effect of LIFO inventory liquidation on income	100,000
Disposition of Property, Plant and Equipment
Net amount of (gains) losses netted against depreciation expense	214,200,000	54,100,000	$ 27,100,000
Additional operating expenses	$ 28,700,000	22,800,000	26,900,000
Schedule of rental trucks depreciation:
Percentage reduction for year one, depreciation	16.00%
Percentage reduction for year two, depreciation	13.00%
Percentage reduction for year three, depreciation	11.00%
Percentage reduction for year four, depreciation	9.00%
Percentage reduction for year five, depreciation	8.00%
Percentage reduction for year six, depreciation	7.00%
Percentage reduction for year seven, depreciation	6.00%
Salvage value percentage under the old declining balance method	15.00%
Percentage reduction if straight line approach used each year for depreciation calculation	5.70%
Real Estate Companies Disclosures [Abstract]
Carrying value of surplus real estate	$ 67,800,000	68,800,000
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]
Self insurance reserve	418,900,000	427,100,000
Accrued insurance, noncurrent	19,700,000	17,500,000
Marketing and Advertising Expense [Abstract]
Advertising expense	13,700,000	18,000,000.0	13,700,000
Policyholder Benefits and Claims Incurred [Abstract]
Deferred sales inducements, net	15,700,000	16,000,000.0
Deferred sales inducements, amortization expense	4,700,000	4,300,000	5,500,000
Adoption of New Accounting Pronounements
Other components of net periodic benefit cost	1,120,000	987,000	$ 1,054,000
Operating lease commitment, asset	620,824,000	877,038,000
Operating lease commitment, liability	74,197,000
All Nonrental Equipment [Member]
LIFO Method Related Items [Abstract]
Inventory, LIFO reserve	$ 37,400,000	$ 21,800,000

Accounting Policies (Inventories, net) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Inventory, Net [Abstract]
Truck and trailer parts and accessories (a)	$ 148,237	$ 95,976
Hitches and towing components (b)	32,508	19,972
Moving supplies and propane (b)	16,623	12,877
Subtotal	197,368	128,825
Less: LIFO reserves	(37,400)	(21,832)
Less: excess and obsolete reserves	(1,080)	(1,416)
Total	$ 158,888	$ 105,577

Reinsurance Recoverables and Trade Receivables, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Reinsurance Recoverables and Trade Receivables, Net [Abstract]
Reinsurance recoverable	$ 50,586	$ 47,394	$ 66,386
Trade accounts receivable	150,285		121,251
Paid losses recoverable	345		276
Accrued investment income	28,689		27,883
Premiums and agents' balances	1,650		2,546
Independent dealer receivables	73		258
Other receivables	6,364		10,247
Reinsurance recoverables and trade receivables, gross	237,992		228,847
Less: Allowance for doubtful accounts	(8,649)		(4,421)
Reinsurance recoverables and trade receivables, net	$ 229,343		$ 224,426

Investments (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
Investments (Narratives) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Assets held by insurance regulators	$ 27.1	$ 27.7
Fair value of sold available-for-sale securities	352.3	523.9	$ 264.5
Available-for-sale securities, gross realized gains	9.5	9.6	6.4
Available-for-sale securities, gross realized losses	1.4	$ 2.1	$ 0.2
Available for sale investments, unrealized loss position
Available for sale investments, unrealized loss position	$ 0.5
Minimum [Member]
Real Estate [Abstract]
Debt instrument, maturity year	2022
Maximum [Member]
Real Estate [Abstract]
Debt instrument, maturity year	2036
Mortgages [Member] \| Minimum [Member]
Real Estate [Abstract]
Mortgage loan interest rate	3.50%
Mortgages [Member] \| Maximum [Member]
Real Estate [Abstract]
Mortgage loan interest rate	5.90%

Investments (Available-for-sale investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Available-for-sale securities, investments:
Amortized cost	$ 2,664,037	$ 2,405,612
Gross unrealized gains	170,294	250,254
Gross unrealized losses more than 12 months	(445)	(224)
Gross unrealized losses less than 12 months	(12,734)	(783)
Allowance for Expected Credit Losses	(60)	(1,320)
Estimated market value	2,821,092	2,653,539
U.S. treasury securities and government obligations [Member]
Available-for-sale securities, investments:
Amortized cost	128,078	92,429
Gross unrealized gains	7,984	12,941
Gross unrealized losses more than 12 months	0	0
Gross unrealized losses less than 12 months	(969)	0
Allowance for Expected Credit Losses	0	0
Estimated market value	135,093	105,370
U.S. government agency mortgage-backed securities [Member]
Available-for-sale securities, investments:
Amortized cost	44,678	61,427
Gross unrealized gains	280	911
Gross unrealized losses more than 12 months	(42)	(1)
Gross unrealized losses less than 12 months	(3,111)	(132)
Allowance for Expected Credit Losses	0	0
Estimated market value	41,805	62,205
Obligations of states and political subdivisions [Member]
Available-for-sale securities, investments:
Amortized cost	178,040	230,521
Gross unrealized gains	15,450	25,249
Gross unrealized losses more than 12 months	0	(59)
Gross unrealized losses less than 12 months	(508)	(3)
Allowance for Expected Credit Losses	0	0
Estimated market value	192,982	255,708
Corporate securities [Member]
Available-for-sale securities, investments:
Amortized cost	1,989,212	1,846,507
Gross unrealized gains	138,909	199,447
Gross unrealized losses more than 12 months	(402)	(163)
Gross unrealized losses less than 12 months	(6,604)	(640)
Allowance for Expected Credit Losses	(60)	(1,320)
Estimated market value	2,121,055	2,043,831
Mortgage-backed securities [Member]
Available-for-sale securities, investments:
Amortized cost	324,029	174,728
Gross unrealized gains	7,671	11,706
Gross unrealized losses more than 12 months	(1)	(1)
Gross unrealized losses less than 12 months	(1,542)	(8)
Allowance for Expected Credit Losses	0	0
Estimated market value	$ 330,157	$ 186,425

Investments (Adjusted cost and estimated market value of available-for-sale investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Available-for-sale securities, amortized cost:
Amortized cost	$ 2,664,037	$ 2,405,612
Available-for-sale securities, fair value:
Estimated market value	2,821,092	2,653,539
Us Government Corporate Securities [Member]
Available-for-sale securities, amortized cost:
Due in one year or less	97,969	90,142
Due after one year through five years	541,840	562,442
Due after five years through ten years	704,295	672,733
Due after ten years	995,904	905,567
Amortized cost	2,340,008	2,230,884
Available-for-sale securities, fair value:
Due in one year or less	99,432	91,190
Due after one year through five years	570,135	601,818
Due after five years through ten years	765,073	754,536
Due after ten years	1,056,295	1,019,570
Estimated market value	2,490,935	2,467,114
Mortgage backed securities [Member]
Available-for-sale securities, amortized cost:
Amortized cost	324,029	174,728
Available-for-sale securities, fair value:
Estimated market value	$ 330,157	$ 186,425

Investments (Available for sale equity investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Marketable Securities [Abstract]
Amortized cost, equity investments	$ 53,728	$ 29,809
Estimated market value, equity investments	72,307	42,117
Common stocks [Member]
Marketable Securities [Abstract]
Amortized cost, equity investments	27,674	9,775
Estimated market value, equity investments	46,212	20,440
Non-redeemable preferred stocks [Member]
Marketable Securities [Abstract]
Amortized cost, equity investments	26,054	20,034
Estimated market value, equity investments	$ 26,095	$ 21,677

Investments (Carrying value of other investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Investments [Abstract]
Mortgage loans, net	$ 423,163	$ 391,230
Short-term investments	30,916	7,234
Real estate	67,824	68,813
Policy loans	10,309	11,163
Other equity investments	11,543	11,319
Total investments	$ 543,755	$ 489,759

Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Other Assets [Abstract]
Deposits (debt-related)	$ 37,588	$ 33,952
Cash surrender value of life insurance policies	0	567
Deposits (real estate related)	22,821	13,211
Other assets, total	$ 60,409	$ 47,730

Net Investment and Interest Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Net Investment Income [Line Items]
Investment income	$ 155,541	$ 129,970	$ 142,683
Less: investment expenses	(7,280)	(7,032)	(4,854)
Net investment and interest income	148,261	122,938	137,829
Fixed Maturities [Member]
Net Investment Income [Line Items]
Investment income	111,625	102,021	107,434
Real Estate [Member]
Net Investment Income [Line Items]
Investment income	5,648	5,769	7,304
Insurance policy loans [Member]
Net Investment Income [Line Items]
Investment income	705	829	974
Mortgage loans [Member]
Net Investment Income [Line Items]
Investment income	25,850	18,248	17,164
Short-term, amounts held by ceding reinsurers, net and other investments [Member]
Net Investment Income [Line Items]
Investment income	$ 11,713	$ 3,103	$ 9,807

Borrowings (Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
Borrowings (Narratives) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Debt instruments, face, payment, and remaining balance amount:
Notes, loans and leases payable	$ 6,022,497	$ 4,668,907
Debt instruments, issuance and maturity dates:
Remaining Lease Term Finance Lease Weighted Average	3	3
Minimum [Member]
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2022
Maximum [Member]
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2036
Rental Truck (amortizing loans) First Loan [Member] \| Uhaul International, Inc and AMERCO [Member]
Debt instruments, face, payment, and remaining balance amount:
Capitalized assets, net book value	$ 1,068,300	$ 718,300
Lease Cost [Abstract]
Sale Leaseback Transaction Lease Terms	(7) years
Rental Truck (amortizing loans) First Loan [Member] \| Uhaul International, Inc and AMERCO [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.60%
Rental Truck (amortizing loans) First Loan [Member] \| Uhaul International, Inc and AMERCO [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	4.68%
Capital Lease Obligations [Member] \| Amerco Real Estate Co and Uhaul International, Inc [Member]
Debt instruments, face, payment, and remaining balance amount:
Amounts held at LIBOR plus margin	$ 150,000
New capital lease obligations, amount	$ 600,000
Capital Lease Obligations [Member] \| Amerco Real Estate Co and Uhaul International, Inc [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.43%
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2029
Capital Lease Obligations [Member] \| Amerco Real Estate Co and Uhaul International, Inc [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.78%
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2033
Finance Lease [Member] \| Amerco [Member]
Debt instruments, face, payment, and remaining balance amount:
Capitalized assets, net book value	$ 620,800	$ 877,000
Lease Cost [Abstract]
Sale Leaseback Transaction Lease Terms	(7) year terms
Finance Lease [Member] \| Amerco [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.16%
Finance Lease [Member] \| Amerco [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	5.04%
Amerco Real Estate Subsidiaries and Uhaul Company of Florida [Member] \| Real estate loan (amortizing term) [Member]
Debt instruments, interest rate, effective percentage:
LIBOR	0.33%
Applicable margin interest rate	1.50%
Sum of LIBOR and margin, maximum rate	1.83%
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Senior mortgages [Member]
Debt instruments, interest rate, effective percentage:
Debt Weighted Average Interest Rate	4.00%
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Senior mortgages [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.70%
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Senior mortgages [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	5.50%
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Working capital loans two [Member] \| Amerco [Member]
Debt instruments, face, payment, and remaining balance amount:
Line of credit facility, remaining borrowing capacity	$ 385,000
Notes, loans and leases payable	$ 385,000
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Working capital loans two [Member] \| Amerco [Member] \| Minimum [Member]
Debt instruments, interest rate, effective percentage:
LIBOR	0.21%
Applicable margin interest rate	1.25%
Sum of LIBOR and margin, maximum rate	1.46%
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Working capital loans two [Member] \| Amerco [Member] \| Maximum [Member]
Debt instruments, interest rate, effective percentage:
LIBOR	0.45%
Applicable margin interest rate	1.50%
Sum of LIBOR and margin, maximum rate	1.85%
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Rental Truck (amortizing loans) Second Loan [Member] \| Uhual International, Inc [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.36%
Debt instruments, interest rate, effective percentage:
LIBOR	0.21%
Debt instruments, face, payment, and remaining balance amount:
Line of credit facility, maximum borrowing capacity	$ 590,000
Amounts held at LIBOR plus margin	385,000
Notes, loans and leases payable	560,000
Amount held at fixed interest rate	$ 100,000
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Rental Truck (amortizing loans) Second Loan [Member] \| Uhual International, Inc [Member] \| Minimum [Member]
Debt instruments, interest rate, effective percentage:
Applicable margin interest rate	1.15%
Sum of LIBOR and margin, maximum rate	1.36%
Various Subsidiaries of Amerco Real Estate and Uhaul Intl [Member] \| Rental Truck (amortizing loans) Second Loan [Member] \| Uhual International, Inc [Member] \| Maximum [Member]
Debt instruments, interest rate, effective percentage:
Applicable margin interest rate	1.25%
Sum of LIBOR and margin, maximum rate	1.46%
Amerco Real Estate Company [Member] \| Real estate loans (revolving credit) [Member]
Debt instruments, interest rate, effective percentage:
LIBOR	0.21%
Applicable margin interest rate	1.38%
Sum of LIBOR and margin, maximum rate	1.59%
Unused capacity fee	0.30%
Debt instruments, face, payment, and remaining balance amount:
Line of credit facility, maximum borrowing capacity	$ 200,000
Amounts held at LIBOR plus margin	300,000
Notes, loans and leases payable	$ 150,000
Uhaul Intl and Subsidiaries [Member] \| Amerco [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.61%
Uhaul Intl and Subsidiaries [Member] \| Amerco [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	4.66%
Uhaul Intl and Subsidiaries [Member] \| Capital Lease Obligations [Member] \| Amerco [Member]
Debt instruments, face, payment, and remaining balance amount:
Line of credit facility, remaining borrowing capacity	$ 150,000
New capital lease obligations, amount	600,000
Subsidiary holdings of parent company debt	$ 100,000
Uhaul Intl and Subsidiaries [Member] \| Capital Lease Obligations [Member] \| Amerco [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.55%
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2030
Uhaul Intl and Subsidiaries [Member] \| Capital Lease Obligations [Member] \| Amerco [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.88%
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2035
Amerco, Us Bank, National Association, Trustee [Member] \| Other Obligations [Member]
Debt instruments, face, payment, and remaining balance amount:
Notes, loans and leases payable	$ 88,500
Subsidiary holdings of parent company debt	$ 2,300
Amerco, Us Bank, National Association, Trustee [Member] \| Other Obligations [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.50%
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2022
Amerco, Us Bank, National Association, Trustee [Member] \| Other Obligations [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	8.00%
Debt instruments, issuance and maturity dates:
Debt instrument, maturity year	2049
Life Insurance [Member] \| FHLB [Member]
Federal Home Loan Bank, Advances, Activity for the year [Abstract]
Deposit amount			$ 60,000
Available for sale equity securities, noncurrent			105,600
Available for sale equity securities pledged as collateral			$ 62,800
Life Insurance [Member] \| FHLB [Member] \| Minimum [Member]
Federal Home Loan Bank, Advances, Activity for the year [Abstract]
Deposit interest rate			0.49%
Life Insurance [Member] \| FHLB [Member] \| Maximum [Member]
Federal Home Loan Bank, Advances, Activity for the year [Abstract]
Deposit interest rate			1.72%

Borrowings (Long-term debt borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Debt instrument, maturities:
Notes, loans and finance/capital leases payable	$ 6,059,713	$ 4,698,615
Less: Debt issuance costs	(37,216)	(29,708)
Total notes, loans and finance/capital leases payable, net	$ 6,022,497	4,668,907
Minimum [Member]
Debt instrument, maturities:
Debt instrument, maturity year	2022
Maximum [Member]
Debt instrument, maturities:
Debt instrument, maturity year	2036
Real estate loan (amortizing term) [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.83%
Debt instrument, maturities:
Debt instrument, maturity year range, end	2023
Notes, loans and finance/capital leases payable	$ 50,259	82,913
Senior mortgages [Member]
Debt instrument, maturities:
Debt instrument, maturity year range, start	2023
Debt instrument, maturity year range, end	2042
Notes, loans and finance/capital leases payable	$ 2,206,268	2,125,324
Senior mortgages [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.70%
Senior mortgages [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	5.50%
Real estate loans (revolving credit) [Member]
Debt instrument, maturities:
Debt instrument, maturity year range, start	2023
Debt instrument, maturity year range, end	2025
Notes, loans and finance/capital leases payable	$ 535,000	535,000
Real estate loans (revolving credit) [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.58%
Real estate loans (revolving credit) [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	3.14%
Fleet loans (amortizing) [Member]
Debt instrument, maturities:
Debt instrument, maturity year range, start	2022
Debt instrument, maturity year range, end	2028
Notes, loans and finance/capital leases payable	$ 124,651	176,295
Fleet loans (amortizing) [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.61%
Fleet loans (amortizing) [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	4.66%
Fleet loans (securitization) [Member]
Debt instrument, maturities:
Debt instrument, maturity year range, start	2024
Debt instrument, maturity year range, end	2026
Notes, loans and finance/capital leases payable	$ 560,000	535,000
Fleet loans (securitization) [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.30%
Fleet loans (securitization) [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.36%
Fleet Loans (revolving credit) [Member]
Debt instrument, maturities:
Debt instrument, maturity year range, start	2022
Debt instrument, maturity year range, end	2026
Notes, loans and finance/capital leases payable	$ 347,393	513,623
Fleet Loans (revolving credit) [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.16%
Fleet Loans (revolving credit) [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	5.04%
Capital leases (rental equipment) [Member]
Debt instrument, maturities:
Debt instrument, maturity year range, start	2024
Debt instrument, maturity year range, end	2030
Notes, loans and finance/capital leases payable	$ 949,936	644,375
Capital leases (rental equipment) [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.60%
Capital leases (rental equipment) [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	4.68%
Private placements [Member]
Debt instrument, maturities:
Debt instrument, maturity year range, start	2029
Debt instrument, maturity year range, end	2035
Notes, loans and finance/capital leases payable	$ 1,200,000	0
Private placements [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.43%
Private placements [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	2.88%
Other Obligations [Member]
Debt instrument, maturities:
Debt instrument, maturity year range, start	2022
Debt instrument, maturity year range, end	2049
Notes, loans and finance/capital leases payable	$ 86,206	$ 86,085
Other Obligations [Member] \| Minimum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	1.50%
Other Obligations [Member] \| Maximum [Member]
Debt instruments, interest rate, stated percentage:
Debt instrument, interest rate, stated percentage	8.00%

Borrowings (Annual maturities of Notes, Loans and Leases Payable) (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Long-term debt, by Maturity:
2022	$ 478,954
2023	937,542
2024	898,740
2025	570,127
2026	559,961
Thereafter	2,614,389
Total	$ 6,059,713

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References + Details

Interest on Borrowings (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]
Interest paid in cash including payments related to derivative contracts	$ 147.9	$ 153.2	$ 168.1

Interest on Borrowings (Components of interest expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Interest expense, borrowings:
Interest expense	$ 167,618	$ 165,484	$ 180,444
Capitalized interest	(9,700)	(11,573)	(23,517)
Amortization of transaction costs	5,556	5,949	4,427
Interest expense resulting rom derivatives	3,950	3,642	(404)
Total interest expense	$ 167,424	$ 163,502	$ 160,950

Interest on Borrowings (Interest Rates and Company Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Interest and debt expense:
Weighted average interest rate during the year	1.40%	1.40%	3.31%
Interest rate at year end	1.49%	1.40%	2.86%
Maximum amount outstanding during the year	$ 1,105,000	$ 1,175,000	$ 1,086,000
Average amount outstanding during the year	1,085,074	1,088,293	1,002,081
Facility fees	$ 253	$ 261	$ 193

Derivatives (Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
Derivatives (Narratives) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax	$ 457	$ (429)	$ (6,301)
Notional amount of operating lease				$ 7,500	$ 6,600
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months	3,900
Derivative hedge market value	$ 1,200
Derivative Notional Amount				$ 416,700	$ 282,700

Derivatives (Interest rate contracts designated as hedging instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Interest Rate Fair Value Hedges [Abstract]
Assets	$ 0	$ 0
Liabilities	(587)	(5,141)
Notional amount (debt)	$ 235,000	$ 235,000

Derivatives (Effect of interest rate contracts on statement of operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Effect of Interest rate Contracts [Abstract]
(Gain) recognized in AOCI on interest rate contracts (effective portion)	$ 4,553	$ 3,071	$ (8,355)
Gain reclassified from AOCI into income	$ (3,948)	$ (3,640)	$ 3

Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]
Balance as of March 31, 2020	$ 106,857
Foreign currency translation	(2,828)	$ (5,694)	$ 9,377
Unrealized net loss on investments	(62,626)	76,969	97,943
Change in fair value of cash flow hedges	457	(429)	(6,301)
Amounts reclassified into earnings on hedging activities	2,978	2,746	(2)
Change in postretirement benfit obligations	1,546	(1,387)	333
Other comprehensive income (loss)	(60,473)	72,205	101,350
Balance as of March 31, 2021	46,384	106,857
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]
Balance as of March 31, 2020	(52,929)	(47,235)	(56,612)
Foreign currency translation	(2,828)	(5,694)	9,377
Unrealized net loss on investments	0	0	0
Change in fair value of cash flow hedges	0	0	0
Amounts reclassified into earnings on hedging activities	0	0	0
Change in postretirement benfit obligations	0	0	0
Other comprehensive income (loss)	(2,828)	(5,694)	9,377
Balance as of March 31, 2021	(55,757)	(52,929)	(47,235)
Unrealized Gain (Loss) on Investments
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]
Balance as of March 31, 2020	167,653	90,684	(7,259)
Foreign currency translation	0	0	0
Unrealized net loss on investments	(62,626)	76,969	97,943
Change in fair value of cash flow hedges	0	0	0
Amounts reclassified into earnings on hedging activities	0	0	0
Change in postretirement benfit obligations	0	0	0
Other comprehensive income (loss)	(62,626)	76,969	97,943
Balance as of March 31, 2021	105,027	167,653	90,684
Fair Market Value of Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]
Balance as of March 31, 2020	(3,879)	(6,196)	107
Foreign currency translation	0	0	0
Unrealized net loss on investments	0	0	0
Change in fair value of cash flow hedges	457	(429)	(6,301)
Amounts reclassified into earnings on hedging activities	2,978	2,746	(2)
Change in postretirement benfit obligations	0	0	0
Other comprehensive income (loss)	3,435	2,317	(6,303)
Balance as of March 31, 2021	(444)	(3,879)	(6,196)
Postretirement Benefit Obligation Gain (Loss)
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]
Balance as of March 31, 2020	(3,988)	(2,601)	(2,934)
Foreign currency translation	0	0	0
Unrealized net loss on investments	0	0	0
Change in fair value of cash flow hedges	0	0	0
Amounts reclassified into earnings on hedging activities	0	0	0
Change in postretirement benfit obligations	1,546	(1,387)	333
Other comprehensive income (loss)	1,546	(1,387)	333
Balance as of March 31, 2021	(2,442)	(3,988)	(2,601)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward]
Balance as of March 31, 2020	106,857	34,652	(66,698)
Foreign currency translation	(2,828)	(5,694)	9,377
Unrealized net loss on investments	(62,626)	76,969	97,943
Change in fair value of cash flow hedges	457	(429)	(6,301)
Amounts reclassified into earnings on hedging activities	2,978	2,746	(2)
Change in postretirement benfit obligations	1,546	(1,387)	333
Other comprehensive income (loss)	(60,473)	72,205	101,350
Balance as of March 31, 2021	$ 46,384	$ 106,857	$ 34,652

Stockholders' Equity (Narratives) (Details)	12 Months Ended
Stockholders' Equity (Narratives) (Details)	Mar. 31, 2022 $ / shares
Dividends Declared
Dividends payable, date declared	Oct. 06, 2021
Dividend paid, amount per share	$ 0.50
Dividends payable, date of record	Oct. 18, 2021
Dividends payable, date to be paid	Oct. 29, 2021
Dividends declared two [Member]
Dividends Declared
Dividends payable, date declared	Aug. 19, 2021
Dividend paid, amount per share	$ 0.50
Dividends payable, date of record	Sep. 07, 2021
Dividends payable, date to be paid	Sep. 21, 2021
Dividends declared three [Member]
Dividends Declared
Dividends payable, date declared	Jun. 09, 2021
Dividend paid, amount per share	$ 0.50
Dividends payable, date of record	Jun. 24, 2021
Dividends payable, date to be paid	Jul. 08, 2021
Dividends declared four [Member]
Dividends Declared
Dividends payable, date declared	Dec. 09, 2020
Dividend paid, amount per share	$ 2.00
Dividends payable, date of record	Dec. 21, 2020
Dividends payable, date to be paid	Dec. 30, 2020
Dividends declared five [Member]
Dividends Declared
Dividends payable, date declared	Aug. 20, 2020
Dividend paid, amount per share	$ 0.50
Dividends payable, date of record	Sep. 07, 2020
Dividends payable, date to be paid	Sep. 21, 2020

Provision for Taxes (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Components of Deferred Tax Assets and Liabilities [Abstract]
NOL and credit carryforwards, federal amount	$ 146.0
NOL and credit carryfowards, state amount	366.0
Provisional benefit amount	243.0
Deferred tax assets, effect of Tax Cuts and Jobs Act, tax expense (benefit)	458.5
Reclassified amount from accumulated other comprehensive income to retained earnings		$ 384.9
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]
Unrecognized tax benefits, income tax penalties and interest accrued	15.7	$ 14.3
Unrecognized tax benefits, income tax penalties and interest expense	$ 1.4

Provision for Taxes (Earnings before taxes and provision for taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Pretax earnings:
U.S.	$ 1,431,155	$ 773,030	$ 372,687
Non-U.S.	44,342	23,628	5,437
Total pretax earnings	1,475,497	796,658	378,124
Current provision (benefit)
Federal	189,488	100,521	(373,817)
State	55,518	16,572	(9,600)
Non-U.S.	6,893	3,404	949
Current provision (benefit), total	251,899	120,497	(382,468)
Deferred provision (benefit)
Federal	90,852	53,957	307,846
State	6,355	9,795	9,728
Non-U.S.	3,105	1,553	970
Deferred provision (benefit), total	100,312	65,305	318,544
Provision for income tax expense	352,211	185,802	(63,924)
Income taxes paid (net of income tax refunds)	$ (4,548)	$ 29,044	$ 6,859

Provision for Taxes (Effective income tax rate reconciliation) (Details)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax rate	21.00%	21.00%	21.00%
Increase (Reduction) in Rate Resulting from [Abstract]
NOL tax rate benefit	0.00%	0.00%	(38.62%)
State taxes, net of federal benefit	3.24%	2.53%	0.02%
Foreign rate differential	0.05%	0.00%	0.21%
Federal tax credits	0.19%	0.99%	0.53%
Transition tax	0.00%	0.00%	0.00%
Tax exempt income	(0.03%)	(0.08%)	(0.17%)
Dividends received deduction	0.00%	0.01%	0.01%
Other	(0.20%)	0.87%	1.19%
Actual tax expense of operations	23.87%	23.32%	(16.91%)

Provision for Taxes (Significant components of deferred tax assets and liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Deferred tax assets:
Net operating loss and credit carry forwards	$ 36,367	$ 30,432
Accrued expenses	114,152	109,740
Policy benefits and losses, claims and loss expenses payable, net	30,572	26,799
Operating leases, assets	15,540	19,370
Total deferred tax assets	196,631	186,341
Deferred tax liabilities:
Property, plant and equipment	1,395,216	1,280,703
Operating leases, liabilities	15,540	19,370
Deferred policy acquisition costs	12,962	13,696
Unrealized gains	36,299	48,667
Other	1,972	2,394
Total deferred tax liabilities	1,461,989	1,364,830
Net deferred tax liability	$ 1,265,358	$ 1,178,489

Provision for Taxes (Reconciliation of total amounts of unrecognized tax benefits roll forward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits beginning balance	$ 31,069	$ 29,632
Revaluation based on change in after tax benefit	0	0
Additions based on tax positions related to the current year	8,257	1,479
Reductions for tax positions of prior years	0	(42)
Additions for tax provisions of prior years	9,525	0
Unrecognized tax benefits ending balance	$ 48,851	$ 31,069

Employee Benefit Plans (Narratives) (Details) - USD ($)	12 Months Ended
Employee Benefit Plans (Narratives) (Details) - USD ($)	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Compensation of related costs, Share-based Payments [Abstract]
Employee stock ownership plan (ESOP), compensation expense	$ 23,000,000.0	$ 23,000,000.0	$ 10,300,000
Employee stock ownership plan (ESOP), cash contributions to ESOP			5,600,000
Cash contributions to ESOP non leveraged	$ 23,000,000.0	$ 23,000,000.0	$ 4,000,000.0
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Defined benefit plan, health care cost trend rate assumed for next fiscal year	4.90%
Defined benefit plan, ultimate health care cost trend rate	4.00%
Post retirement health insurance [Member]
Deferred Compensation Arrangements [Abstract]
Lifetime maximum benefit paid per individual	$ 20,000
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Defined benefit plan, health care cost trend rate assumed for next fiscal year	5.00%
Post retirement life insurance [Member]
Deferred Compensation Arrangements [Abstract]
Lifetime maximum benefit paid per individual	$ 3,000
Additional benefit requirement amount	$ 100
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Defined benefit plan, ultimate health care cost trend rate	4.00%

Employee Benefit Plans (Summary of Financing Arrangements for Leveraged ESOP Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Issued July, 2009 [Member]
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	$ 0
Employee stock ownership plan (ESOP), interest payments	0	$ 0	$ 9
Issued February, 2016 [Member]
Debt Disclosure [Abstract]
Employee stock ownership plan (ESOP), debt structure, indirect loan, amount	0
Employee stock ownership plan (ESOP), interest payments	$ 0	$ 0	$ 229

Employee Benefit Plans (Shares Held by the ESOP Plan) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
Allocated shares	890	951
Unreleased shares	0	0
Fair value of unreleased shares	$ 0	$ 0
Unreleased shares non-leveraged	0	0
Fair value of unreleased shares non-leveraged	$ 0	$ 0

Employee Benefit Plans (Components of net periodic post retirement benefit cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Postemployment Benefits [Abstract]
Service cost for benefits earned during the period	$ 1,401	$ 1,267	$ 1,055
Interest cost on accumulated postretirement benefit	908	919	964
Other components	212	68	90
Total other components of net periodic benefit costs	1,120	987	1,054
Net periodic postretirement benefit cost	$ 2,521	$ 2,254	$ 2,109

Employee Benefit Plans (Components of Postretirement Benefit Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning of year	$ 30,755	$ 27,503
Service cost for benefits earned during the period	1,401	1,267	$ 1,055
Interest cost on accumulated post retirement benefit	908	919	964
Net benefit payments and expense	(1,021)	(841)
Actuarial loss	(1,837)	1,907
Accumulated postretirement benefit obligation	30,206	30,755	$ 27,503
Liabilities:
Current liabilities	1,449	1,334
Non-currrent liabilities	28,757	29,421
Total post retirement benefit liability recognized in statement of financial position	30,206	30,755
Components included in accumulated other comprehensive income (loss):
Unrecognized net loss	(3,237)	(5,286)
Cumulative net periodic benefit cost (in excess of employer contribution)	$ 26,969	$ 25,469

Employee Benefit Plans (Discount Rate Assumptions in Computation of Accumulated Postretirement Benefit Obligation) (Details)	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Accumulated postretirement benefit obligation	3.76%	2.93%	3.37%

Employee Benefit Plans (Future Net Benefit Payments Expected for Post Employee Benefit Obligations) (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2022	$ 1,369
2023	1,536
2024	1,733
2025	1,950
2026	2,170
2027 through 2030	12,112
Total	$ 20,870

Fair Value Measurements (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales	$ 0.1	$ 0.2

Fair Value Measurements (Carrying and Estimated Fair Values within Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Assets
Reinsurance recoverables and trade receivables, net	$ 229,343	$ 224,426
Mortgage loans, Fair Value	450,347	391,230
Other investments	120,592	98,529
Total	800,282	714,185
Liabilities
Notes, loans and leases payable, gross	5,875,781	4,449,691
Total	5,875,781	4,449,691
Level 1 [Member]
Assets
Reinsurance recoverables and trade receivables, net	0	0
Mortgage loans, Fair Value	0	0
Other investments	0	0
Total	0	0
Liabilities
Notes, loans and leases payable, gross	0	0
Total	0	0
Level 2 [Member]
Assets
Reinsurance recoverables and trade receivables, net	0	0
Mortgage loans, Fair Value	0	0
Other investments	0	0
Total	0	0
Liabilities
Notes, loans and leases payable, gross	6,059,713	4,698,615
Total	6,059,713	4,698,615
Level 3 [Member]
Assets
Reinsurance recoverables and trade receivables, net	229,343	224,426
Mortgage loans, Fair Value	423,163	391,230
Other investments	120,592	98,529
Total	773,098	714,185
Liabilities
Notes, loans and leases payable, gross	0	0
Total	0	0
Carrying Value
Assets
Reinsurance recoverables and trade receivables, net	229,343	224,426
Mortgage loans, Fair Value	423,163	391,230
Other investments	120,592	98,529
Total	773,098	714,185
Liabilities
Notes, loans and leases payable, gross	6,059,713	4,698,615
Total	$ 6,059,713	$ 4,698,615

Fair Value Measurements (Financial Instruments Level within the Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Assets:
Short-term investments	$ 2,482,154	$ 839,250
Fixed maturities - available for sale	2,821,092	2,653,539
Preferred stock	26,095	21,677
Common stock	46,212	20,440
Derivatives	7,474	6,601
Total	5,383,027	3,541,507
Liabilities:
Derivatives	587	5,141
Total	587	5,141
Level 1 [Member]
Assets:
Short-term investments	2,482,154	839,250
Fixed maturities - available for sale	26,914	6,967
Preferred stock	26,095	21,677
Common stock	46,212	20,440
Derivatives	7,474	6,601
Total	2,588,849	894,935
Liabilities:
Derivatives	0	0
Total	0	0
Level 2 [Member]
Assets:
Short-term investments	0	0
Fixed maturities - available for sale	2,794,086	2,646,415
Preferred stock	0	0
Common stock	0	0
Derivatives	0	0
Total	2,794,086	2,646,415
Liabilities:
Derivatives	587	5,141
Total	587	5,141
Level 3 [Member]
Assets:
Short-term investments	0	0
Fixed maturities - available for sale	92	157
Preferred stock	0	0
Common stock	0	0
Derivatives	0	0
Total	92	157
Liabilities:
Derivatives	0	0
Total	$ 0	$ 0

Reinsurance and Policy Benefits and Losses, Claims and Loss Expenses Payable (Narratives) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reinsurance Disclosures [Abstract]
Maximum amount of life insurance retained on any one life	$ 150,000
Letters of credit held at year end from re-insurers	100,000
Letters of credit issued at year end	$ 47,400,000	$ 18,800,000

Reinsurance and Policy Benefits and Losses, Claims and Loss Expenses Payable (Insurance Subsidiaries Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Year ended December 31,
Direct amount (a) - Life insurance in force	$ 1,029,537	$ 1,031,634	$ 957,280
Ceded to other companies - Life insurance in force	72	73	7
Assumed from other companies - Life insurance in force	328,030	356,266	441,563
Net amount (a) - Life insurance in force	$ 1,357,495	$ 1,387,827	$ 1,398,836
Percentage of amount assumed to net - Life insurance in force	24.00%	26.00%	32.00%
Direct amount (a)	$ 194,849	$ 185,635	$ 189,343
Ceded to Other Companies	162	212	227
Assumed from Other Companies	6,007	6,471	8,001
Net amount (a)	200,694	191,894	197,117
Premiums earned: Life [Member]
Year ended December 31,
Direct amount (a)	56,353	58,048	53,289
Ceded to Other Companies	2	1	1
Assumed from Other Companies	4,514	5,049	5,629
Net amount (a)	$ 60,865	$ 63,096	$ 58,917
Percentage of amount assumed to net	7.00%	8.00%	10.00%
Premiums earned: Accident and health [Member]
Year ended December 31,
Direct amount (a)	$ 48,385	$ 57,081	$ 66,863
Ceded to Other Companies	160	211	226
Assumed from Other Companies	1,166	1,388	1,563
Net amount (a)	$ 49,391	$ 58,258	$ 68,200
Percentage of amount assumed to net	2.00%	2.00%	2.00%
Premiums earned: Annuity [Member]
Year ended December 31,
Direct amount (a)	$ 444	$ 221	$ 65
Ceded to Other Companies	0	0	0
Assumed from Other Companies	327	34	794
Net amount (a)	$ 771	$ 255	$ 859
Percentage of amount assumed to net	42.00%	13.00%	92.00%
Premiums earned: Property and casualty [Member]
Year ended December 31,
Direct amount (a)	$ 89,667	$ 70,285	$ 69,126
Ceded to Other Companies	0	0	0
Assumed from Other Companies	0	0	15
Net amount (a)	$ 89,667	$ 70,285	$ 69,141
Percentage of amount assumed to net	0.00%	0.00%	0.00%

Reinsurance and Policy Benefits and Losses Claims and Loss Expenses Payable (Policy Benefits and Losses, Claims and Loss Expenses Payable for Property and Casualty Insurance) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reinsurance:
Unpaid losses and loss adjustment expense		$ 159,162
Total	$ 978,254		$ 997,701
Property and Casualty Insurance [Member]
Reinsurance:
Unpaid losses and loss adjustment expense		159,162		$ 177,963	$ 209,127	$ 228,970
Operating Segments [Member] \| Property and Casualty Insurance [Member]
Reinsurance:
Unpaid losses and loss adjustment expense		159,162		177,963
Reinsurance losses payable		1,217		979
Total	$ 160,379	$ 160,379	$ 178,942	$ 178,942

Reinsurance and Policy Benefits and Losses, Claims, and Loss Expenses Payable (Activity in the Liability for Unpaid Losses and Loss Adjustment Expenses for Property and Casualty Insurance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Paid related to:
Net balance at December 31	$ 111,768
Plus: reinsurance recoverables	47,394
Balance at December 31	159,162
Property and Casualty Insurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at January 1	177,963	$ 209,127	$ 228,970
Less: reinsurance recoverables	64,873	87,083	94,920
Net balance at January 1	113,090	122,044	134,050
Incurred related to:
Current year	28,980	20,670	22,137
Prior years	(6,290)	(3,865)	(9,535)
Total incurred	22,690	16,805	12,602
Paid related to:
Current year	11,040	7,664	7,366
Prior years	12,972	18,095	17,242
Total paid	24,012	25,759	24,608
Net balance at December 31	111,768	113,090	122,044
Plus: reinsurance recoverables	47,394	64,873	87,083
Balance at December 31	159,162	177,963	$ 209,127
Operating Segments [Member] \| Property and Casualty Insurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at January 1	177,963
Paid related to:
Balance at December 31	$ 159,162	$ 177,963

Reinsurance and Policy Benefits and Losses, Claims, and Loss Expenses Payable (Incurred Claims Development) (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 18,698
Shortduration Insurance Contracts Number Of Reported Claims	13,729
Accident Year 2014 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 11,093	$ 11,092	$ 11,087	$ 12,464	$ 12,460	$ 12,459	$ 12,214
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 0
Shortduration Insurance Contracts Number Of Reported Claims	11,104
Accident Year 2015 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 11,764	11,764	11,790	13,056	13,011	$ 13,297
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 0
Shortduration Insurance Contracts Number Of Reported Claims	11,469
Accident Year 2016 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 15,273	15,538	17,078	16,109	$ 15,748
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 0
Shortduration Insurance Contracts Number Of Reported Claims	12,102
Accident Year 2017 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 17,157	18,027	18,386	$ 19,580
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 251
Shortduration Insurance Contracts Number Of Reported Claims	11,983
Accident Year 2018 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 27,316	26,316	$ 22,138
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 2,283
Shortduration Insurance Contracts Number Of Reported Claims	11,746
Accident Year 2019 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 17,485	$ 20,671
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 3,455
Shortduration Insurance Contracts Number Of Reported Claims	11,274
Accident Year 2020 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 28,982

Reinsurance And Policy Benefits And Losses Claims And Loss Expenses Payable (Cumulative Paid Claims And Allocated Claim Adjustment Expense Net Of Reinsurance) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	$ 96,255
All outstanding liabilities before 2012, net of reinsurance	78,955
Liabilities for claims and claim adjustment expenses, net of reinsurance	111,768
Accident Year 2014 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	11,093	$ 11,092	$ 11,087	$ 10,343	$ 9,730	$ 9,601	$ 7,509
Accident Year 2015 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	11,764	11,764	11,746	11,643	10,665	$ 7,777
Accident Year 2016 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	15,263	15,012	14,825	11,638	$ 8,970
Accident Year 2017 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	16,766	15,150	12,689	$ 8,838
Accident Year 2018 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	19,215	14,737	$ 7,366
Accident Year 2019 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	11,114	$ 7,665
Accident Year 2020 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	$ 11,040

Reinsurance And Policy Benefits And Losses Claims And Loss Expenses Payable (Total Gross Liability For Unpaid Property And Casualty Claims And Claim Adjustment Expense) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Shortduration Insurance Contracts Liability For Unpaid Claims And Allocated Claim Adjustment Expense Net [Abstract]
Liabilities for unpaid property and casualty claims and claim adjustment expenses, net of reinsurance		$ 111,768
Total reinsurance recoverable on unpaid property and casualty claims	$ 50,586	47,394	$ 66,386
Total gross liability for unpaid Property and Casualty claims and claim adjustment expense		$ 159,162

Reinsurance And Policy Benefits And Losses Claims And Loss Expenses Payable (Average Annual Percentage Payout Of Incurred Claims By Age Net Of Reinsurance) (Details) - Property and Casualty Insurance [Member]	Dec. 31, 2021
Average annual Percentage Payout [Abstract]
Year 1	50.40%
Year 2	21.70%
Year 3	12.20%
Year 4	4.30%
Year 5	2.80%
Year 6	0.00%
Year 7	0.00%

Leases (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
Leases (Narratives) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Right Of Use Asset Obtained In Exchange For Operating Lease Liability	$ 347.4	$ 513.6
Right Of Use Asset Obtained In Exchange For Finance Lease Liability	74.2	92.5
Operating Cash Flows For Financing Leases	30.2	29.3	$ 25.9
Cash paid for finance leases	166.3	221.2	307.8
Cash paid for operating leases	$ 3.7	$ 6.8	$ 15.4

Leases (Components Right Of Use Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Finance Lease [Abstract]
Building and Improvements	$ 136,444	$ 132,901
Furniture and equipment	14,731	22,316
Rental trailers and rental equipment	169,514	203,594
Rental trucks	1,114,248	1,494,098
Right Of Use Assets Gross	1,434,937	1,852,909
less: accumulated depreciation	(739,731)	(883,366)
Right of use assets, net	695,206	969,543
Finance Lease [Member]
Finance Lease [Abstract]
Building and Improvements	0	0
Furniture and equipment	14,731	22,316
Rental trailers and rental equipment	169,514	203,594
Rental trucks	1,114,248	1,494,098
Right Of Use Assets Gross	1,298,493	1,720,008
less: accumulated depreciation	(677,669)	(842,970)
Right of use assets, net	620,824	877,038
Operating Lease [Member]
Finance Lease [Abstract]
Building and Improvements	136,444	132,901
Furniture and equipment	0	0
Rental trailers and rental equipment	0	0
Rental trucks	0	0
Right Of Use Assets Gross	136,444	132,901
less: accumulated depreciation	(62,062)	(40,396)
Right of use assets, net	$ 74,382	$ 92,505

Leases (Finance Leases Weighted Average Remaining Lease Term and Discount Rate) (Details)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Finance Leases Weighted Average Remaining Lease Term And Discount Rate [Abstract]
Remaining Lease Term Finance Lease Weighted Average	3	3
Finance Lease Weighted Average Discount Rate Percent	3.70%	3.60%

Leases (Operating Leases Weighted Average Remaining Lease Term and Discount Rate) (Details)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Leases Remaining Lease Term And Weighted Average Discount Rate [Abstract]
Remaining Lease Term Operating Lease Weighted Average	16.5	14.7
Operating Lease Weighted Average Discount Rate Percent	4.60%	4.60%

Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Lease Cost [Abstract]
Operating Lease cost	$ 30,239	$ 30,551
Finance Lease Cost [Abstract]
Finance Lease Right Of Use Asset Amortization	115,199	150,994
Finance Lease Interest Expense	15,289	22,405
Sum of finance lease cost	$ 130,488	$ 173,399

Leases (Maturities Of Lease Liabilities) (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Finance Lease Liabilities Payments Due [Abstract]
2022	$ 133,577
2023	111,781
2024	78,280
2025	47,064
2026	0
Thereafter	0
Total lease payments	370,702
Less: imputed interest	(23,309)
Finance Lease Liability	347,393
Operating Lease Liabilities Payments Due [Abstract]
2022	23,311
2023	21,903
2024	10,630
2025	4,162
2026	3,061
Thereafter	59,348
Total lease payments	122,415
Less: imputed interest	(48,218)
Operating Lease Liability	$ 74,197

Related Party Transactions (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]
Property Management Fee [Abstract]
Management fees received exclusive of reimbursed expenses	$ 38.5	$ 31.2	$ 29.0
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] \| Minimum [Member]
Property Management Fee [Abstract]
Management fee rate	4.00%
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] \| Maximum [Member]
Property Management Fee [Abstract]
Management fee rate	10.00%
Sac Holdings, Four Sac, Five Sac, Galaxy, Privite mini [Member]
Related party costs and expenses:
Revenue, excluding dealer agreement commissions and expenses	$ 28.5
Expenses, related parties	2.4
Cash flow, related party	25.9
Commission expenses, generated from dealer agreement with related parties	417.9
Payments to aquire assets, other	$ 88.3

Related Party Transactions (Related Party Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Related party transactions:
Management fees revenue	$ 35,194	$ 31,603	$ 30,406
Revenue from related parties	35,194	31,603	30,406
Blackwater [Member]
Related party transactions:
Management fees revenue	28,546	25,512	24,014
Mercury [Member]
Related party transactions:
Management fees revenue	$ 6,648	$ 6,091	$ 6,392

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Related Party Cost and Expense [Abstract]
Related party expenses, total	$ 90,733	$ 71,824	$ 64,697
Blackwater [Member]
Related Party Cost and Expense [Abstract]
U-Haul lease expenses	2,445	2,612	2,631
U-Haul commission expenses	$ 88,288	$ 69,212	$ 62,066

Related Party Transactions (Related Party Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Related party assets:
U-Haul receivables	$ 6,364	$ 10,247
Related party assets	47,851	35,395
Blackwater [Member]
Related party assets:
Notes receivable	41,364	27,116
Mercury [Member]
Related party assets:
Notes receivable	5,708	9,632
Insurance Subsidiaries [Member]
Related party assets:
Other	$ 779	$ (1,353)

- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

Statutory Financial Information of Insurance Subsidiaries (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Repwest [Member]
Statutory financial information of insurance subsidiaries:
Statutory accounting practices, statutory amount available for dividend payments	$ 26.7
Dividend payments restrictions schedule, amounts paid	22.6	$ 21.6
Oxford [Member]
Statutory financial information of insurance subsidiaries:
Statutory accounting practices, statutory amount available for dividend payments	$ 23.0
Dividend payments restrictions schedule, amounts paid		$ 18.6
Restricted net assets, subsidiaries			$ 91.7	$ 105.4

Statutory Financial Information of Insurance Subsidiaries (Net income (loss) Capital and Surplus (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Repwest [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	$ 33,314	$ 22,898	$ 28,614
Audited statutory capital and surplus	266,875	227,380	226,999
ARCOA [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	(752)	2,438	2,906
Audited statutory capital and surplus	14,697	15,928	12,851
Oxford [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	23,217	6,296	18,599
Audited statutory capital and surplus	230,202	218,301	223,264
CFLIC [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	6,019	8,082	8,043
Audited statutory capital and surplus	17,098	25,980	26,305
NAI [Member]
Statutory financial information of insurance subsidiaries:
Audit statutory net income (loss)	1,874	2,127	1,942
Audited statutory capital and surplus	$ 7,961	$ 13,980	$ 13,371

Financial Information by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Fiscal year ended:
Total revenues	$ 5,739,747	$ 4,541,985	$ 3,978,868
Depreciation and amortization, net of (gains) losses on disposals	512,486	641,504	667,524
Interest expense	167,424	163,502	160,950
Pretax earnings	1,475,497	796,658	378,124
Income tax expense	352,211	185,802	(63,924)
Identifiable assets	17,299,581	14,651,606	13,438,024
United States [Member]
Fiscal year ended:
Total revenues	5,452,027	4,334,083	3,797,849
Depreciation and amortization, net of (gains) losses on disposals	509,517	631,344	652,110
Interest expense	163,586	160,429	157,595
Pretax earnings	1,431,155	773,030	372,687
Income tax expense	342,213	180,845	(65,842)
Identifiable assets	16,776,070	14,212,978	13,016,942
Canada [Member]
Fiscal year ended:
Total revenues	287,720	207,902	181,019
Depreciation and amortization, net of (gains) losses on disposals	2,969	10,160	15,414
Interest expense	3,838	3,073	3,355
Pretax earnings	44,342	23,628	5,437
Income tax expense	9,998	4,957	1,918
Identifiable assets	$ 523,511	$ 438,628	$ 421,082

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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+ Details

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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+ Details

Consolidating financial information by industry segment (Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Mar. 31, 2019
ASSETS:
Cash and cash equivalents	$ 2,704,137		$ 1,194,012		$ 494,352	$ 673,701
Reinsurance recoverables and trade receivables, net	229,343		224,426
Inventories, net	158,888		105,577
Prepaid expenses	236,915		469,144
Investments, fixed maturities and marketable equities	2,893,399		2,695,656
Investments, other	543,755		489,759
Deferred policy acquisition costs, net	103,828		89,749
Other assets	60,409		47,730
Right of use assets, financing, net	620,824		877,038
Right of use assets, operating	74,382		92,505
Related party assets	47,851		35,395
Subtotal assets	7,673,731		6,320,991
Investments in subsidiaries	0		0
Property, plant and equipment, at cost:
Land	1,283,142		1,075,813
Buildings and improvements	5,974,639		5,163,705
Furniture and equipment	846,132		786,505
Property, plant and equipment (gross)	13,358,406		11,413,668
Less: Accumulated depreciation	(3,732,556)		(3,083,053)
Total property, plant and equipment	9,625,850		8,330,615
Total assets	17,299,581		14,651,606		13,438,024
Liabilities:
Accounts payable and accrued expenses	677,785		645,575
Notes, loans and leases payable	6,022,497		4,668,907
Operating lease liabilities	74,197		92,510
Policy benefits and losses, claims and loss expenses payable	978,254		997,701
Liabilities from investment contracts	2,336,238		2,161,530
Other policyholders' funds and liabilities	10,812		12,420
Deferred income	49,157		42,592
Deferred income taxes	1,265,358		1,178,489
Related party liabilities	0		0
Total liabilities	11,414,298		9,799,724
Stockholders' equity:
Additional paid-in capital	453,819		453,819
Accumulated other comprehensive loss	46,384		106,857
Retained earnings	6,052,233		4,958,359
Total stockholders' equity	5,885,283		4,851,882
Total liabilities and stockholders' equity	17,299,581		14,651,606
Rental Trailers and Other Rental Equipment [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	615,679		477,921
Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	4,638,814		3,909,724
Series A Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0		0
Series B Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0		0
Series A Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	0		0
Amerco Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	10,497		10,497
Common Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	(525,653)		(525,653)
Preferred Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	(151,997)		(151,997)
Operating Segments [Member] \| Moving and Storage Consolidations [Member]
ASSETS:
Cash and cash equivalents	2,643,213		1,010,275		459,078	643,918
Reinsurance recoverables and trade receivables, net	142,895		118,741
Inventories, net	158,888		105,577
Prepaid expenses	236,915		469,144
Investments, fixed maturities and marketable equities	0		0
Investments, other	20,653		20,733
Deferred policy acquisition costs, net	0		0
Other assets	57,305		44,763
Right of use assets, financing, net	620,824		877,038
Right of use assets, operating	74,190		92,245
Related party assets	64,611		54,042
Subtotal assets	4,019,494		2,792,558
Investments in subsidiaries	737,073		741,860
Property, plant and equipment, at cost:
Land	1,283,142		1,075,813
Buildings and improvements	5,974,639		5,163,705
Furniture and equipment	846,132		786,505
Property, plant and equipment (gross)	13,358,406		11,413,668
Less: Accumulated depreciation	(3,732,556)		(3,083,053)
Total property, plant and equipment	9,625,850		8,330,615
Total assets	14,382,417		11,865,033
Liabilities:
Accounts payable and accrued expenses	663,482		636,257
Notes, loans and leases payable	6,022,497		4,657,720
Operating lease liabilities	73,998		92,236
Policy benefits and losses, claims and loss expenses payable	418,890		427,073
Liabilities from investment contracts	0		0
Other policyholders' funds and liabilities	0		0
Deferred income	49,157		42,592
Deferred income taxes	1,244,639		1,136,149
Related party liabilities	25,668		25,413
Total liabilities	8,498,331		7,017,440
Stockholders' equity:
Additional paid-in capital	454,029		454,029
Accumulated other comprehensive loss	45,187		102,568
Retained earnings	6,052,023		4,958,149
Total stockholders' equity	5,884,086		4,847,593
Total liabilities and stockholders' equity	14,382,417		11,865,033
Operating Segments [Member] \| Moving and Storage Consolidations [Member] \| Rental Trailers and Other Rental Equipment [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	615,679		477,921
Operating Segments [Member] \| Moving and Storage Consolidations [Member] \| Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	4,638,814		3,909,724
Operating Segments [Member] \| Moving and Storage Consolidations [Member] \| Series A Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0		0
Operating Segments [Member] \| Moving and Storage Consolidations [Member] \| Series B Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0		0
Operating Segments [Member] \| Moving and Storage Consolidations [Member] \| Series A Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	0		0
Operating Segments [Member] \| Moving and Storage Consolidations [Member] \| Amerco Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	10,497		10,497
Operating Segments [Member] \| Moving and Storage Consolidations [Member] \| Common Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	(525,653)		(525,653)
Operating Segments [Member] \| Moving and Storage Consolidations [Member] \| Preferred Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	(151,997)		(151,997)
Operating Segments [Member] \| Property and Casualty Insurance [Member]
ASSETS:
Cash and cash equivalents	10,800		5,658		4,794	5,757
Reinsurance recoverables and trade receivables, net	50,235		67,069
Inventories, net	0		0
Prepaid expenses	0		0
Investments, fixed maturities and marketable equities	297,488		295,753
Investments, other	114,269		90,412
Deferred policy acquisition costs, net	0		0
Other assets	371		436
Right of use assets, financing, net	0		0
Right of use assets, operating	93		92
Related party assets	6,713		6,854
Subtotal assets	479,969		466,274
Investments in subsidiaries	0		0
Property, plant and equipment, at cost:
Land	0		0
Buildings and improvements	0		0
Furniture and equipment	0		0
Property, plant and equipment (gross)	0		0
Less: Accumulated depreciation	0		0
Total property, plant and equipment	0		0
Total assets	479,969		466,274
Liabilities:
Accounts payable and accrued expenses	3,849		2,029
Notes, loans and leases payable	0		0
Operating lease liabilities	93		96
Policy benefits and losses, claims and loss expenses payable	160,379	$ 160,379	178,942	$ 178,942
Liabilities from investment contracts	0		0
Other policyholders' funds and liabilities	3,521		3,698
Deferred income	0		0
Deferred income taxes	12,803		13,046
Related party liabilities	3,196		5,821
Total liabilities	183,841		203,632
Stockholders' equity:
Additional paid-in capital	91,120		91,120
Accumulated other comprehensive loss	16,630		22,546
Retained earnings	185,077		145,675
Total stockholders' equity	296,128		262,642
Total liabilities and stockholders' equity	479,969		466,274
Operating Segments [Member] \| Property and Casualty Insurance [Member] \| Rental Trailers and Other Rental Equipment [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	0		0
Operating Segments [Member] \| Property and Casualty Insurance [Member] \| Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	0		0
Operating Segments [Member] \| Property and Casualty Insurance [Member] \| Series A Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0		0
Operating Segments [Member] \| Property and Casualty Insurance [Member] \| Series B Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0		0
Operating Segments [Member] \| Property and Casualty Insurance [Member] \| Series A Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	0		0
Operating Segments [Member] \| Property and Casualty Insurance [Member] \| Amerco Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	3,301		3,301
Operating Segments [Member] \| Property and Casualty Insurance [Member] \| Common Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	0		0
Operating Segments [Member] \| Property and Casualty Insurance [Member] \| Preferred Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	0		0
Operating Segments [Member] \| Life Insurance [Member]
ASSETS:
Cash and cash equivalents	50,124		178,079		30,480	24,026
Reinsurance recoverables and trade receivables, net	36,213		38,616
Inventories, net	0		0
Prepaid expenses	0		0
Investments, fixed maturities and marketable equities	2,595,911		2,399,903
Investments, other	408,833		378,614
Deferred policy acquisition costs, net	103,828		89,749
Other assets	2,733		2,531
Right of use assets, financing, net	0		0
Right of use assets, operating	99		168
Related party assets	16,911		13,850
Subtotal assets	3,214,652		3,101,510
Investments in subsidiaries	0		0
Property, plant and equipment, at cost:
Land	0		0
Buildings and improvements	0		0
Furniture and equipment	0		0
Property, plant and equipment (gross)	0		0
Less: Accumulated depreciation	0		0
Total property, plant and equipment	0		0
Total assets	3,214,652		3,101,510
Liabilities:
Accounts payable and accrued expenses	10,454		7,289
Notes, loans and leases payable	0		11,187
Operating lease liabilities	106		178
Policy benefits and losses, claims and loss expenses payable	398,985		391,686
Liabilities from investment contracts	2,336,238		2,161,530
Other policyholders' funds and liabilities	7,291		8,722
Deferred income	0		0
Deferred income taxes	7,916		29,294
Related party liabilities	12,717		12,406
Total liabilities	2,773,707		2,622,292
Stockholders' equity:
Additional paid-in capital	26,271		26,271
Accumulated other comprehensive loss	87,200		140,817
Retained earnings	324,974		309,630
Total stockholders' equity	440,945		479,218
Total liabilities and stockholders' equity	3,214,652		3,101,510
Operating Segments [Member] \| Life Insurance [Member] \| Rental Trailers and Other Rental Equipment [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	0		0
Operating Segments [Member] \| Life Insurance [Member] \| Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	0		0
Operating Segments [Member] \| Life Insurance [Member] \| Series A Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0		0
Operating Segments [Member] \| Life Insurance [Member] \| Series B Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0		0
Operating Segments [Member] \| Life Insurance [Member] \| Series A Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	0		0
Operating Segments [Member] \| Life Insurance [Member] \| Amerco Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	2,500		2,500
Operating Segments [Member] \| Life Insurance [Member] \| Common Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	0		0
Operating Segments [Member] \| Life Insurance [Member] \| Preferred Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	0		0
Eliminations [Member]
ASSETS:
Cash and cash equivalents	0		0		$ 0	$ 0
Reinsurance recoverables and trade receivables, net	0		0
Inventories, net	0		0
Prepaid expenses	0		0
Investments, fixed maturities and marketable equities	0		0
Investments, other	0		0
Deferred policy acquisition costs, net	0		0
Other assets	0		0
Right of use assets, financing, net	0		0
Right of use assets, operating	0		0
Related party assets	(40,384)		(39,351)
Subtotal assets	(40,384)		(39,351)
Investments in subsidiaries	(737,073)		(741,860)
Property, plant and equipment, at cost:
Land	0		0
Buildings and improvements	0		0
Furniture and equipment	0		0
Property, plant and equipment (gross)	0		0
Less: Accumulated depreciation	0		0
Total property, plant and equipment	0		0
Total assets	(777,457)		(781,211)
Liabilities:
Accounts payable and accrued expenses	0		0
Notes, loans and leases payable	0		0
Operating lease liabilities	0		0
Policy benefits and losses, claims and loss expenses payable	0		0
Liabilities from investment contracts	0		0
Other policyholders' funds and liabilities	0		0
Deferred income	0		0
Deferred income taxes	0		0
Related party liabilities	(41,581)		(43,640)
Total liabilities	(41,581)		(43,640)
Stockholders' equity:
Additional paid-in capital	(117,601)		(117,601)
Accumulated other comprehensive loss	(102,633)		(159,074)
Retained earnings	(509,841)		(455,095)
Total stockholders' equity	(735,876)		(737,571)
Total liabilities and stockholders' equity	(777,457)		(781,211)
Eliminations [Member] \| Rental Trailers and Other Rental Equipment [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	0		0
Eliminations [Member] \| Rental Trucks [Member]
Property, plant and equipment, at cost:
Property subject to or available for operating lease, gross	0		0
Eliminations [Member] \| Series A Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0		0
Eliminations [Member] \| Series B Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value, issued	0		0
Eliminations [Member] \| Series A Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	0		0
Eliminations [Member] \| Amerco Common Stock [Member]
Stockholders' equity:
Common stock, value, issued	(5,801)		(5,801)
Eliminations [Member] \| Common Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	0		0
Eliminations [Member] \| Preferred Stock in Treasury [Member]
Stockholders' equity:
Treasury stock, value	$ 0		$ 0

Consolidating financial information by industry segment (Statement of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Self-moving equipment rentals	$ 3,958,807	$ 3,083,317	$ 2,692,413
Self-storage revenues	617,120	477,262	418,741
Self-moving and self-storage products and service sales	351,447	344,929	265,091
Property management fees	35,194	31,603	30,406
Life insurance premiums	111,027	121,609	127,976
Property and casualty insurance premiums	86,518	68,779	66,053
Net investment and interest income	148,261	122,938	137,829
Other revenue	431,373	291,548	240,359
Total revenues	5,739,747	4,541,985	3,978,868
Costs and expenses:
Operating expenses	2,676,541	2,187,684	2,117,148
Commission expenses	429,581	329,609	288,332
Cost of sales	259,585	214,059	164,018
Benefits and losses	186,647	179,512	174,836
Amortization of deferred policy acquisition costs	33,854	28,293	31,219
Lease expense	29,910	28,470	26,882
Depreciation, net of (gains) losses on disposals	482,752	609,930	637,063
Net gains on disposal of real estate	(4,120)	3,281	(758)
Total costs and expenses	4,094,750	3,580,838	3,438,740
Earnings from operations before equity in earnings of subsidiaries	1,644,997	961,147	540,128
Equity in earnings of subsidiaries	0	0	0
Earnings from operations	1,644,997	961,147	540,128
Other components of net periodic benefit costs	(1,120)	(987)	(1,054)
Interest expense	(167,424)	(163,502)	(160,950)
Fees and amortization on early extinguishment of debt	(956)	0	0
Pretax earnings	1,475,497	796,658	378,124
Income tax expense	(352,211)	(185,802)	63,924
Earnings available to common shareholders	1,123,286	610,856	442,048
Operating Segments [Member] \| Moving and Storage Consolidations [Member]
Revenues:
Self-moving equipment rentals	3,963,535	3,086,824	2,696,516
Self-storage revenues	617,120	477,262	418,741
Self-moving and self-storage products and service sales	351,447	344,929	265,091
Property management fees	35,194	31,603	30,406
Life insurance premiums	0	0	0
Property and casualty insurance premiums	0	0	0
Net investment and interest income	3,135	2,259	10,593
Other revenue	427,836	288,797	236,419
Total revenues	5,398,267	4,231,674	3,657,766
Costs and expenses:
Operating expenses	2,621,270	2,137,381	2,069,655
Commission expenses	429,581	329,609	288,332
Cost of sales	259,585	214,059	164,018
Benefits and losses	0	0	0
Amortization of deferred policy acquisition costs	0	0	0
Lease expense	31,973	30,551	27,494
Depreciation, net of (gains) losses on disposals	482,752	609,930	637,063
Net gains on disposal of real estate	(4,120)	3,281	(758)
Total costs and expenses	3,821,041	3,324,811	3,185,804
Earnings from operations before equity in earnings of subsidiaries	1,577,226	906,863	471,962
Equity in earnings of subsidiaries	54,746	44,441	55,789
Earnings from operations	1,631,972	951,304	527,751
Other components of net periodic benefit costs	(1,120)	(987)	(1,054)
Interest expense	(168,491)	(164,592)	(162,062)
Fees and amortization on early extinguishment of debt	(956)
Pretax earnings	1,461,405	785,725	364,635
Income tax expense	(338,119)	(174,869)	77,413
Earnings available to common shareholders	1,123,286	610,856	442,048
Operating Segments [Member] \| Property and Casualty Insurance [Member]
Revenues:
Self-moving equipment rentals	0	0	0
Self-storage revenues	0	0	0
Self-moving and self-storage products and service sales	0	0	0
Property management fees	0	0	0
Life insurance premiums	0	0	0
Property and casualty insurance premiums	89,667	70,285	69,141
Net investment and interest income	25,376	16,452	19,923
Other revenue	0	0	0
Total revenues	115,043	86,737	89,064
Costs and expenses:
Operating expenses	42,456	35,450	33,770
Commission expenses	0	0	0
Cost of sales	0	0	0
Benefits and losses	22,448	18,558	12,410
Amortization of deferred policy acquisition costs	0	0	0
Lease expense	359	231	0
Depreciation, net of (gains) losses on disposals	0	0	0
Net gains on disposal of real estate	0	0	0
Total costs and expenses	65,263	54,239	46,180
Earnings from operations before equity in earnings of subsidiaries	49,780	32,498	42,884
Equity in earnings of subsidiaries	0	0	0
Earnings from operations	49,780	32,498	42,884
Other components of net periodic benefit costs	0	0	0
Interest expense	0	0	0
Fees and amortization on early extinguishment of debt	0
Pretax earnings	49,780	32,498	42,884
Income tax expense	(10,378)	(6,778)	(8,956)
Earnings available to common shareholders	39,402	25,720	33,928
Operating Segments [Member] \| Life Insurance [Member]
Revenues:
Self-moving equipment rentals	0	0	0
Self-storage revenues	0	0	0
Self-moving and self-storage products and service sales	0	0	0
Property management fees	0	0	0
Life insurance premiums	111,027	121,609	127,976
Property and casualty insurance premiums	0	0	0
Net investment and interest income	123,809	107,745	109,018
Other revenue	3,976	3,280	4,470
Total revenues	238,812	232,634	241,464
Costs and expenses:
Operating expenses	21,112	20,376	21,425
Commission expenses	0	0	0
Cost of sales	0	0	0
Benefits and losses	164,199	160,954	162,426
Amortization of deferred policy acquisition costs	33,854	28,293	31,219
Lease expense	109	135	0
Depreciation, net of (gains) losses on disposals	0	0	0
Net gains on disposal of real estate	0	0	0
Total costs and expenses	219,274	209,758	215,070
Earnings from operations before equity in earnings of subsidiaries	19,538	22,876	26,394
Equity in earnings of subsidiaries	0	0	0
Earnings from operations	19,538	22,876	26,394
Other components of net periodic benefit costs	0	0	0
Interest expense	(480)	0	0
Fees and amortization on early extinguishment of debt	0
Pretax earnings	19,058	22,876	26,394
Income tax expense	(3,714)	(4,155)	(4,533)
Earnings available to common shareholders	15,344	18,721	21,861
Eliminations [Member]
Revenues:
Self-moving equipment rentals	(4,728)	(3,507)	(4,103)
Self-storage revenues	0	0	0
Self-moving and self-storage products and service sales	0	0	0
Property management fees	0	0	0
Life insurance premiums	0	0	0
Property and casualty insurance premiums	(3,149)	(1,506)	(3,088)
Net investment and interest income	(4,059)	(3,518)	(1,705)
Other revenue	(439)	(529)	(530)
Total revenues	(12,375)	(9,060)	(9,426)
Costs and expenses:
Operating expenses	(8,297)	(5,523)	(7,702)
Commission expenses	0	0	0
Cost of sales	0	0	0
Benefits and losses	0	0	0
Amortization of deferred policy acquisition costs	0	0	0
Lease expense	(2,531)	(2,447)	(612)
Depreciation, net of (gains) losses on disposals	0	0	0
Net gains on disposal of real estate	0	0	0
Total costs and expenses	(10,828)	(7,970)	(8,314)
Earnings from operations before equity in earnings of subsidiaries	(1,547)	(1,090)	(1,112)
Equity in earnings of subsidiaries	(54,746)	(44,441)	(55,789)
Earnings from operations	(56,293)	(45,531)	(56,901)
Other components of net periodic benefit costs	0	0	0
Interest expense	1,547	1,090	1,112
Fees and amortization on early extinguishment of debt	0
Pretax earnings	(54,746)	(44,441)	(55,789)
Income tax expense	0	0	0
Earnings available to common shareholders	$ (54,746)	$ (44,441)	$ (55,789)

Consolidating financial information by industry segment (Cash Flow Statements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Cash flow from operating activities:
Net earnings	$ 1,123,286	$ 610,856	$ 442,048
Earnings from consolidated subsidiaries	0	0	0
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	696,955	664,001	664,120
Amortization of deferred policy acquisition costs	33,854	28,293	31,219
Amortization of premiums and accretion of discounts related to investments, inc	19,749	14,229	13,317
Amortization of debt issuance costs	5,659	5,948	4,426
Interest credited to policyholders	64,692	55,321	51,857
Change in allowance for losses on trade receivables	4,227	1,206	(14)
Change in allowance for inventory reserves	15,235	1,298	640
Net gains on disposal of personal property	(214,203)	(54,071)	(27,057)
Net gains on disposal of real estate	(4,120)	3,281	(758)
Net gains on sales of investments	(11,872)	(10,058)	(13,596)
Net (gains) losses on equity investments	(7,837)	(394)	(3,783)
Deferred income taxes	101,091	68,411	317,893
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(9,187)	(39,516)	38,129
Inventories and parts	(68,536)	(5,775)	1,776
Prepaid expenses	232,342	94,359	(391,120)
Capitalization of deferred policy acquisition costs	(32,626)	(36,162)	(24,447)
Other assets	(2,706)	29,865	(1,295)
Related party assets	(10,357)	(487)	(5,645)
Accounts payable and accrued expenses	28,752	92,925	(4,530)
Policy benefits and losses, claims and loss expenses payable	(19,692)	(1,992)	(12,618)
Other policyholders' funds and liabilities	(1,608)	2,230	(4,857)
Deferred income	5,216	11,567	(1,818)
Related party liabilities	(2,079)	60	1,626
Net cash provided by operating activities	1,946,235	1,535,395	1,075,513
Cash flow from investing activities:
Escrow deposits	(9,328)	(5,221)	6,617
Purchase of:
Property, plant and equipment	(2,136,537)	(1,441,475)	(2,309,406)
Short term investments	(74,418)	(69,929)	(61,226)
Fixed maturities investments	(627,326)	(606,233)	(379,349)
Equity securities	(19,299)	(962)	(83)
Preferred stock	(8,000)	(16,144)	0
Real estate	(261)	(622)	(4,286)
Mortgage loans	(158,147)	(158,071)	(62,016)
Proceeds from sale and paydowns of:
Property, plant and equipment	623,235	537,484	687,375
Short term investments	51,591	69,718	59,056
Fixed maturities investments	360,937	529,239	268,636
Equity securities	2,046	207	185
Preferred stock	2,000	2,700	2,375
Real estate	113	255	311
Mortgage loans	126,218	29,525	25,162
Net cash used by investing activities	(1,867,176)	(1,129,529)	(1,766,649)
Cash flow from financing activities:
Borrowings from credit facilities	1,969,474	922,008	1,121,412
Principal repayments on credit facilities	(437,506)	(662,588)	(349,986)
Debt issuance costs	(13,156)	(5,793)	(5,332)
Capital lease payments	(166,262)	(221,247)	(307,782)
Employee stock ownership plan value	0	0	(206)
Common stock dividends paid	(29,412)	(49,019)	(29,404)
Net contribution from (to) related party		0	0
Investment contract deposits	347,520	517,856	234,640
Investment contract withdrawals	(237,503)	(213,864)	(151,022)
Net cash provided by financing activities	1,433,155	287,353	512,320
Effects of exchange rate on cash	(2,089)	6,441	(533)
Increase (decrease) cash and cash equivalents	1,510,125	699,660	(179,349)
Cash and cash equivalents at the beginning of period	1,194,012	494,352	673,701
Cash and cash equivalents at the end of the period	2,704,137	1,194,012	494,352
Operating Segments [Member] \| Moving and Storage Consolidations [Member]
Cash flow from operating activities:
Net earnings	1,123,286	610,856	442,048
Earnings from consolidated subsidiaries	(54,746)	(44,441)	(55,789)
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	696,955	664,001	664,120
Amortization of deferred policy acquisition costs	0	0	0
Amortization of premiums and accretion of discounts related to investments, inc	0	0	0
Amortization of debt issuance costs	5,659	5,948	4,426
Interest credited to policyholders	0	0	0
Change in allowance for losses on trade receivables	4,689	1,424	(14)
Change in allowance for inventory reserves	15,235	1,298	640
Net gains on disposal of personal property	(214,203)	(54,071)	(27,057)
Net gains on disposal of real estate	(4,120)	3,281	(758)
Net gains on sales of investments	0	0	0
Net (gains) losses on equity investments	0	0	0
Deferred income taxes	106,869	72,407	323,980
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(28,776)	(60,806)	30,771
Inventories and parts	(68,536)	(5,775)	1,776
Prepaid expenses	232,342	94,359	(391,120)
Capitalization of deferred policy acquisition costs	0	0	0
Other assets	(2,919)	29,879	(3,099)
Related party assets	(10,517)	(12,790)	(5,106)
Accounts payable and accrued expenses	23,839	96,309	(4,428)
Policy benefits and losses, claims and loss expenses payable	(8,428)	14,919	3,092
Other policyholders' funds and liabilities	0	0	0
Deferred income	6,368	10,959	(1,818)
Related party liabilities	255	1,136	(1,170)
Net cash provided by operating activities	1,823,252	1,428,893	980,494
Cash flow from investing activities:
Escrow deposits	(9,328)	(5,221)	6,617
Purchase of:
Property, plant and equipment	(2,136,537)	(1,441,475)	(2,309,406)
Short term investments	0	0	0
Fixed maturities investments	0	0	0
Equity securities	0	0	0
Preferred stock	0	0
Real estate	(33)	0	0
Mortgage loans	0	0	0
Proceeds from sale and paydowns of:
Property, plant and equipment	623,235	537,484	687,375
Short term investments	0	0	0
Fixed maturities investments	0	0	0
Equity securities	0	0	0
Preferred stock	0	0	0
Real estate	113	255	311
Mortgage loans	0	0	0
Net cash used by investing activities	(1,522,550)	(908,957)	(1,615,103)
Cash flow from financing activities:
Borrowings from credit facilities	1,969,474	912,408	1,118,912
Principal repayments on credit facilities	(426,319)	(652,728)	(347,486)
Debt issuance costs	(13,156)	(5,793)	(5,332)
Capital lease payments	(166,262)	(221,247)	(307,782)
Employee stock ownership plan value			(206)
Common stock dividends paid	(29,412)	(49,019)	(29,404)
Net contribution from (to) related party		41,199	21,600
Investment contract deposits	0	0	0
Investment contract withdrawals	0	0	0
Net cash provided by financing activities	1,334,325	24,820	450,302
Effects of exchange rate on cash	(2,089)	6,441	(533)
Increase (decrease) cash and cash equivalents	1,632,938	551,197	(184,840)
Cash and cash equivalents at the beginning of period	1,010,275	459,078	643,918
Cash and cash equivalents at the end of the period	2,643,213	1,010,275	459,078
Operating Segments [Member] \| Property and Casualty Insurance [Member]
Cash flow from operating activities:
Net earnings	39,402	25,720	33,928
Earnings from consolidated subsidiaries	0	0	0
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	0	0	0
Amortization of deferred policy acquisition costs	0	0	0
Amortization of premiums and accretion of discounts related to investments, inc	1,638	1,578	1,469
Amortization of debt issuance costs	0	0	0
Interest credited to policyholders	0	0	0
Change in allowance for losses on trade receivables	(456)	(217)	0
Change in allowance for inventory reserves	0	0	0
Net gains on disposal of personal property	0	0	0
Net gains on disposal of real estate	0	0	0
Net gains on sales of investments	(991)	(158)	(355)
Net (gains) losses on equity investments	(7,837)	(394)	(3,783)
Deferred income taxes	1,347	459	(2,847)
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	17,180	27,302	8,127
Inventories and parts	0	0	0
Prepaid expenses	0	0	0
Capitalization of deferred policy acquisition costs	0	0	0
Other assets	346	537	2,098
Related party assets	160	303	(539)
Accounts payable and accrued expenses	1,821	(3,497)	2,688
Policy benefits and losses, claims and loss expenses payable	(18,563)	(31,398)	(19,618)
Other policyholders' funds and liabilities	(177)	(2,053)	491
Deferred income	0	0	0
Related party liabilities	(2,644)	1,187	819
Net cash provided by operating activities	31,226	19,369	22,478
Cash flow from investing activities:
Escrow deposits	0	0	0
Purchase of:
Property, plant and equipment	0	0	0
Short term investments	(74,418)	(69,929)	(60,590)
Fixed maturities investments	(10,248)	(18,823)	(13,001)
Equity securities	(17,919)	0	0
Preferred stock	0	0
Real estate	(59)	0	(328)
Mortgage loans	(24,032)	(18,035)	(18,050)
Proceeds from sale and paydowns of:
Property, plant and equipment	0	0	0
Short term investments	50,737	69,669	59,056
Fixed maturities investments	24,201	20,854	25,386
Equity securities	20	0	185
Preferred stock	2,000	2,700	1,375
Real estate	0	0	0
Mortgage loans	23,634	17,659	4,126
Net cash used by investing activities	(26,084)	4,095	(1,841)
Cash flow from financing activities:
Borrowings from credit facilities	0	0	0
Principal repayments on credit facilities	0	0	0
Debt issuance costs	0	0	0
Capital lease payments	0	0	0
Employee stock ownership plan value			0
Common stock dividends paid	0	0	0
Net contribution from (to) related party		(22,600)	(21,600)
Investment contract deposits	0	0	0
Investment contract withdrawals	0	0	0
Net cash provided by financing activities	0	(22,600)	(21,600)
Effects of exchange rate on cash	0	0	0
Increase (decrease) cash and cash equivalents	5,142	864	(963)
Cash and cash equivalents at the beginning of period	5,658	4,794	5,757
Cash and cash equivalents at the end of the period	10,800	5,658	4,794
Operating Segments [Member] \| Life Insurance [Member]
Cash flow from operating activities:
Net earnings	15,344	18,721	21,861
Earnings from consolidated subsidiaries	0	0	0
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	0	0	0
Amortization of deferred policy acquisition costs	33,854	28,293	31,219
Amortization of premiums and accretion of discounts related to investments, inc	18,111	12,651	11,848
Amortization of debt issuance costs	0	0	0
Interest credited to policyholders	64,692	55,321	51,857
Change in allowance for losses on trade receivables	(6)	(1)	0
Change in allowance for inventory reserves	0	0	0
Net gains on disposal of personal property	0	0	0
Net gains on disposal of real estate	0	0	0
Net gains on sales of investments	(10,881)	(9,900)	(13,241)
Net (gains) losses on equity investments	0	0	0
Deferred income taxes	(7,125)	(4,455)	(3,240)
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	2,409	(6,012)	(769)
Inventories and parts	0	0	0
Prepaid expenses	0	0	0
Capitalization of deferred policy acquisition costs	(32,626)	(36,162)	(24,447)
Other assets	(133)	(551)	(294)
Related party assets	0	0	0
Accounts payable and accrued expenses	3,092	113	(2,790)
Policy benefits and losses, claims and loss expenses payable	7,299	14,487	3,908
Other policyholders' funds and liabilities	(1,431)	4,283	(5,348)
Deferred income	(1,152)	608	0
Related party liabilities	310	9,737	1,977
Net cash provided by operating activities	91,757	87,133	72,541
Cash flow from investing activities:
Escrow deposits	0	0	0
Purchase of:
Property, plant and equipment	0	0	0
Short term investments	0	0	(636)
Fixed maturities investments	(617,078)	(587,410)	(366,348)
Equity securities	(1,380)	(962)	(83)
Preferred stock	(8,000)	(16,144)
Real estate	(169)	(622)	(3,958)
Mortgage loans	(134,115)	(140,036)	(43,966)
Proceeds from sale and paydowns of:
Property, plant and equipment	0	0	0
Short term investments	854	49	0
Fixed maturities investments	336,736	508,385	243,250
Equity securities	2,026	207	0
Preferred stock	0	0	1,000
Real estate	0	0	0
Mortgage loans	102,584	11,866	21,036
Net cash used by investing activities	(318,542)	(224,667)	(149,705)
Cash flow from financing activities:
Borrowings from credit facilities	0	9,600	2,500
Principal repayments on credit facilities	(11,187)	(9,860)	(2,500)
Debt issuance costs	0	0	0
Capital lease payments	0	0	0
Employee stock ownership plan value			0
Common stock dividends paid	0	0	0
Net contribution from (to) related party		(18,599)	0
Investment contract deposits	347,520	517,856	234,640
Investment contract withdrawals	(237,503)	(213,864)	(151,022)
Net cash provided by financing activities	98,830	285,133	83,618
Effects of exchange rate on cash	0	0	0
Increase (decrease) cash and cash equivalents	(127,955)	147,599	6,454
Cash and cash equivalents at the beginning of period	178,079	30,480	24,026
Cash and cash equivalents at the end of the period	50,124	178,079	30,480
Eliminations [Member]
Cash flow from operating activities:
Net earnings	(54,746)	(44,441)	(55,789)
Earnings from consolidated subsidiaries	54,746	44,441	55,789
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	0	0	0
Amortization of deferred policy acquisition costs	0	0	0
Amortization of premiums and accretion of discounts related to investments, inc	0	0	0
Amortization of debt issuance costs	0	0	0
Interest credited to policyholders	0	0	0
Change in allowance for losses on trade receivables	0	0	0
Change in allowance for inventory reserves	0	0	0
Net gains on disposal of personal property	0	0	0
Net gains on disposal of real estate	0	0	0
Net gains on sales of investments	0	0	0
Net (gains) losses on equity investments	0	0	0
Deferred income taxes	0	0	0
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	0	0	0
Inventories and parts	0	0	0
Prepaid expenses	0	0	0
Capitalization of deferred policy acquisition costs	0	0	0
Other assets	0	0	0
Related party assets	0	12,000	0
Accounts payable and accrued expenses	0	0	0
Policy benefits and losses, claims and loss expenses payable	0	0	0
Other policyholders' funds and liabilities	0	0	0
Deferred income	0	0	0
Related party liabilities	0	(12,000)	0
Net cash provided by operating activities	0	0	0
Cash flow from investing activities:
Escrow deposits	0	0	0
Purchase of:
Property, plant and equipment	0	0	0
Short term investments	0	0	0
Fixed maturities investments	0	0	0
Equity securities	0	0	0
Preferred stock	0	0
Real estate	0	0	0
Mortgage loans	0	0	0
Proceeds from sale and paydowns of:
Property, plant and equipment	0	0	0
Short term investments	0	0	0
Fixed maturities investments	0	0	0
Equity securities	0	0	0
Preferred stock	0	0	0
Real estate	0	0	0
Mortgage loans	0	0	0
Net cash used by investing activities	0	0	0
Cash flow from financing activities:
Borrowings from credit facilities	0	0	0
Principal repayments on credit facilities	0	0	0
Debt issuance costs	0	0	0
Capital lease payments	0	0	0
Employee stock ownership plan value			0
Common stock dividends paid	0	0	0
Net contribution from (to) related party		0	0
Investment contract deposits	0	0	0
Investment contract withdrawals	0	0	0
Net cash provided by financing activities	0	0	0
Effects of exchange rate on cash	0	0	0
Increase (decrease) cash and cash equivalents	0	0	0
Cash and cash equivalents at the beginning of period	0	0	0
Cash and cash equivalents at the end of the period	$ 0	$ 0	$ 0

Revenue Recognition (Revenue Over Time) (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Contract With Customer Liability [Abstract]
2022	$ 22,081
2023	11,063
2024	8,180
2025	6,381
2026	5,254
Thereafter	43,931
Self Moving Equipment
Contract With Customer Liability [Abstract]
2022	5,537
2023	0
2024	0
2025	0
2026	0
Thereafter	0
Property Lease Revenue
Contract With Customer Liability [Abstract]
2022	16,544
2023	11,063
2024	8,180
2025	6,381
2026	5,254
Thereafter	$ 43,931

Revenue Recognition (Revenue disaggregated by timing of revenue recognition) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Revenue From Contract With Customer [Abstract]
Revenues recognized over time	$ 284,401	$ 182,278	$ 147,565
Revenues recognized at point in time	414,985	396,600	309,804
Total revenues recognized under ASC 606	699,386	578,878	457,369
Revenues recognized under ASC 840	4,690,434	3,644,798	3,182,902
Revenues recognized under ASC 944	201,666	195,371	200,768
Revenues recognized under ASC 320	148,261	122,938	137,829
Total revenues	$ 5,739,747	$ 4,541,985	$ 3,978,868

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Allowance for Credit Losses (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
Historical loss rate	1.00%
Available for sale securities, accrued interest receivable		$ 1.7

Allowance for Credit Losses (Reserve Allowance Various Credit Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Valuation And Qualifying Accounts [Abstract]
March 31, 2020	$ 6,242	$ 4,219
Transition adjustment expected credit loss current	2,968	2,023
Write-offs against allowance	0	0
Recoveries	0	0
March 31, 2021	9,210	6,242
Trade Receivables
Valuation And Qualifying Accounts [Abstract]
March 31, 2020	4,421	3,215
Transition adjustment expected credit loss current	4,228	1,206
Write-offs against allowance	0	0
Recoveries	0	0
March 31, 2021	8,649	4,421
Investments, Fixed Maturities
Valuation And Qualifying Accounts [Abstract]
March 31, 2020	1,320	503
Transition adjustment expected credit loss current	(1,260)	817
Write-offs against allowance	0	0
Recoveries	0	0
March 31, 2021	60	1,320
Investments, Other
Valuation And Qualifying Accounts [Abstract]
March 31, 2020	501	501
Transition adjustment expected credit loss current	0	0
Write-offs against allowance	0	0
Recoveries	0	0
March 31, 2021	$ 501	$ 501

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References + Details

Schedule I - Condensed Financial Information of AMERCO (Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Income Taxes Paid, Net [Abstract]
Income taxes paid (net of income tax refunds)	$ (4,548)	$ 29,044	$ 6,859

Schedule I - Condensed Financial Information of AMERCO (Balance Sheets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
ASSETS:
Cash and cash equivalents	$ 2,704,137	$ 1,194,012	$ 494,352	$ 673,701
Investments in subsidiaries	0	0
Related party assets	47,851	35,395
Total assets	17,299,581	14,651,606	13,438,024
Liabilities:
Other Liabilities	11,414,298	9,799,724
Stockholders' equity:
Additional paid-in capital	453,819	453,819
Accumulated other comprehensive loss	46,384	106,857
Consolidated statement of change in equity
Beginning of period	4,958,359
Adjustment for adoption of ASU 2016-13		(2,880)
Net earnings	1,123,286	610,856	442,048
End of period	6,052,233	4,958,359
Total stockholders' equity	5,885,283	4,851,882
Total liabilities and stockholders' equity	17,299,581	14,651,606
Common Stock in Treasury [Member]
Consolidated statement of change in equity
Cost of shares in treasury	(525,653)	(525,653)
Preferred Stock in Treasury [Member]
Consolidated statement of change in equity
Cost of shares in treasury	(151,997)	(151,997)
Amerco [Member]
ASSETS:
Cash and cash equivalents	2,085,447	751,053	294,528	$ 428,950
Investments in subsidiaries	4,240,811	3,284,760
Related party assets	1,821,654	1,535,355
Other assets	178,691	413,167
Total assets	8,326,603	5,984,335
Liabilities:
Other Liabilities	2,442,517	1,136,742
Stockholders' equity:
Preferred stock	0	0
Common stock	10,497	10,497
Additional paid-in capital	454,029	454,029
Accumulated other comprehensive loss	45,187	102,568
Consolidated statement of change in equity
Beginning of period	4,958,149	4,399,192
Adjustment for adoption of ASU 2016-13	0	(2,880)
Net earnings	1,123,286	610,856	442,048
Dividends	(29,412)	(49,019)
End of period	6,052,023	4,958,149	$ 4,399,192
Total stockholders' equity	5,884,086	4,847,593
Total liabilities and stockholders' equity	8,326,603	5,984,335
Amerco [Member] \| Common Stock in Treasury [Member]
Consolidated statement of change in equity
Cost of shares in treasury	(525,653)	(525,653)
Amerco [Member] \| Preferred Stock in Treasury [Member]
Consolidated statement of change in equity
Cost of shares in treasury	$ (151,997)	$ (151,997)

Schedule I - Condensed Financial Information of AMERCO (Statements of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Net interest income from subs	$ 5,739,747	$ 4,541,985	$ 3,978,868
Expenses:
Operating expenses	2,676,541	2,187,684	2,117,148
Total costs and expenses	4,094,750	3,580,838	3,438,740
Equity in earnings of subsidiaries	0	0	0
Pretax earnings	1,475,497	796,658	378,124
Income tax expense	(352,211)	(185,802)	63,924
Earnings available to common shareholders	$ 1,123,286	$ 610,856	$ 442,048
Basic and diluted earnings per common share	$ 57.29	$ 31.15	$ 22.55
Weighted average common shares outstanding: basic and diluted	19,607,788	19,607,788	19,603,708
Amerco [Member]
Revenues:
Net interest income from subs	$ 1,516	$ 720	$ 6,586
Expenses:
Operating expenses	5,517	6,753	10,622
Other expenses	115	115	96
Total costs and expenses	5,632	6,868	10,718
Equity in earnings of subsidiaries	1,011,841	508,632	205,940
Interest income	131,400	135,673	130,670
Pretax earnings	1,139,125	638,157	332,478
Income tax expense	(15,839)	(27,301)	109,570
Earnings available to common shareholders	$ 1,123,286	$ 610,856	$ 442,048
Basic and diluted earnings per common share	$ 57.29	$ 31.15	$ 22.55
Weighted average common shares outstanding: basic and diluted	19,607,788	19,607,788	19,603,708

Schedule I - Condensed Financial Information Of AMERCO (Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Net earnings	$ 1,123,286	$ 610,856	$ 442,048
Amerco [Member]
Net earnings	1,123,286	610,856	442,048
Other comprehensive income (loss)	(60,473)	72,205	101,350
Total comprehensive income	$ 1,062,813	$ 683,061	$ 543,398

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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+ Details

Schedule I - Condensed Financial Information of AMERCO (Statements of Cash Flow) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Cash flow from operating activities:
Net earnings	$ 1,123,286	$ 610,856	$ 442,048
Earnings from consolidated subsidiaries	0	0	0
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	696,955	664,001	664,120
Net loss on sales of investments	(11,872)	(10,058)	(13,596)
Deferred income taxes	101,091	68,411	317,893
Net change in other operating assets and liabilities:
Reinsurance recoverables and trade receivables	(9,187)	(39,516)	38,129
Prepaid expenses	232,342	94,359	(391,120)
Other assets	(2,706)	29,865	(1,295)
Related party assets	(10,357)	(487)	(5,645)
Accounts payable and accrued expenses	28,752	92,925	(4,530)
Net cash provided by operating activities	1,946,235	1,535,395	1,075,513
Cash flow from investing activities:
Purchases of property, plant and equipment	(2,136,537)	(1,441,475)	(2,309,406)
Proceeds of equity securities	2,046	207	185
Net cash used by investing activities	(1,867,176)	(1,129,529)	(1,766,649)
Cash flow from financing activities:
Borrowings from credit facilities	1,969,474	922,008	1,121,412
Principal repayments on credit facilities	(437,506)	(662,588)	(349,986)
Debt issuance costs	(13,156)	(5,793)	(5,332)
Common stock dividends paid	(29,412)	(49,019)	(29,404)
Net contribution from (to) related party		0	0
Net Cash Provided by (Used in) Financing Activities	1,433,155	287,353	512,320
Effects of exchange rate on cash	(2,089)	6,441	(533)
Increase (decrease) cash and cash equivalents	1,510,125	699,660	(179,349)
Cash and cash equivalents at the beginning of period	1,194,012	494,352	673,701
Cash and cash equivalents at the end of the period	2,704,137	1,194,012	494,352
Amerco [Member]
Cash flow from operating activities:
Net earnings	1,123,286	610,856	442,048
Earnings from consolidated subsidiaries	(1,011,841)	(508,632)	(205,940)
Adjustments to reconcile net earnings to cash provided by operations:
Depreciation	1	1	1
Net loss on sales of investments	292	924	0
Deferred income taxes	106,869	72,407	323,980
Net change in other operating assets and liabilities:
Prepaid expenses	234,490	88,898	(381,190)
Other assets	(4)	0	22
Related party assets	(240)	(12,000)	0
Accounts payable and accrued expenses	5,461	(4,019)	1,935
Net cash provided by operating activities	458,314	248,435	180,856
Cash flow from investing activities:
Purchases of property, plant and equipment	(11)	(3)	0
Proceeds of equity securities	0	0	0
Net cash used by investing activities	(11)	(3)	0
Cash flow from financing activities:
Borrowings from credit facilities	1,200,000	200,000	0
Principal repayments on credit facilities	0	(200,000)	0
Debt issuance costs	(8,468)	(924)	0
Proceeds from (repayments) of intercompany loans	(284,438)	211,064	(311,534)
Common stock dividends paid	(29,412)	(49,019)	(29,404)
Net contribution from (to) related party	0	41,199	21,600
Net Cash Provided by (Used in) Financing Activities	877,682	202,320	(319,338)
Effects of exchange rate on cash	(1,591)	5,773	4,060
Increase (decrease) cash and cash equivalents	1,334,394	456,525	(134,422)
Cash and cash equivalents at the beginning of period	751,053	294,528	428,950
Cash and cash equivalents at the end of the period	$ 2,085,447	$ 751,053	$ 294,528

Schedule II - AMERCO and Consolidated Subsidiaries, Valuation and Qualifying Accounts (Details) - Amerco [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Allowance for doubtful accounts (deducted from trade receivable) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 4,421	$ 535	$ 549
Additions charged to cost and expenses	5,283	2,179	731
Additions charged to other accounts	1,679	2,680	0
Deductions	(2,734)	(973)	(745)
Balance at year end	8,649	4,421	535
Allowance for obsolescence (deducted from inventory) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	1,416	3,063	2,322
Additions charged to cost and expenses	0	0	741
Additions charged to other accounts	0	0	0
Deductions	(336)	(1,647)	0
Balance at year end	1,080	1,416	3,063
Allowance for LIFO (deducted from inventory) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	21,832	18,886	18,987
Additions charged to cost and expenses	15,568	2,946	0
Additions charged to other accounts	0	0	0
Deductions	0	0	(101)
Balance at year end	37,400	21,832	18,886
Allowance for probable losses (deducted from mortgage loans) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	448	493	493
Additions charged to cost and expenses	0	0	0
Additions charged to other accounts	0	0	0
Deductions	0	(45)	0
Balance at year end	$ 448	$ 448	$ 493

Schedule V - AMERCO and Consolidated Subsidiaries, Supplemental Information (for Property-Casualty Insurance Operations) (Details) - Property Casualty Insurance Operations [Member] - Amerco [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Information For Property And Casualty Insurance Underwriters [Abstract]
Deferred policy acquisition costs	$ 0	$ 0	$ 0
Reserves for unpaid claims and claims adjustment expense	159,162	177,963	209,127
Discount if any, deducted	0	0	0
Unearned premiums	334	(294)	233
Net earned premiums (1)	89,667	70,285	69,141
Net investment income (2)	24,385	16,335	19,926
Claim and claim adjustment expenses incurred related to current year	28,980	20,670	22,137
Prior years	(6,290)	(3,865)	(9,535)
Amortization of deferred policy acquisition costs	0	0	0
Paid claims and claim adjustment expense	24,012	25,759	24,608
Net premiums written (1)	$ 90,002	$ 69,989	$ 66,277

Schedule V - AMERCO and Consolidated Subsidiaries, Supplemental Information (for Property-Casualty Insurance Operations), Parenthetical (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investment Income, Net [Abstract]
Premiums Earned, Net	$ 200,694	$ 191,894	$ 197,117
Property Casualty Insurance Operations [Member] \| Amerco [Member]
Investment Income, Net [Abstract]
Written premiums, net	3,100	1,500	3,100
Premiums Earned, Net	2,800	1,800	2,800
(Gain) Loss on Investments	$ 1,000	$ 100	$ 400