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.