Basis of Presentation	12 Months Ended
Mar. 31, 2021
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 2020, 2019 and 2018 correspond to fiscal 2021, 2020 and 2019 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.

Basis of Presentation

12 Months Ended

Mar. 31, 2021

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 2020, 2019 and 2018 correspond to fiscal 2021, 2020 and 2019 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.