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