Schedule I - Condensed Financial Information of U-Haul Holding Company (Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Net earnings	$ 922,998	$ 1,123,286	$ 610,856
U-Haul Holding Company [Member]
Net earnings	922,998	1,123,286	610,856
Other comprehensive income (loss)	(318,052)	(57,381)	67,468
Total comprehensive income	$ 604,946	$ 1,065,905	$ 678,324