Schedule I - Condensed Financial Information of U-Haul Holding Company (Balance Sheets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
ASSETS:
Cash and cash equivalents	$ 2,060,524	$ 2,704,137
Investments in subsidiaries	0	0
Related party assets	48,308	47,851
Total assets	18,124,648	17,299,581	$ 14,651,606
Liabilities:
Other Liabilities	11,596,313	11,347,089
Stockholders' equity:
Additional paid-in capital	453,643	453,819
Accumulated other comprehensive loss	(267,046)	46,384
Consolidated statement of change in equity
Beginning of period	6,119,442
Net earnings	922,998	1,123,286	610,856
Series N Non-Voting Common Stock Dividends	(14,117)	0	0
End of period	7,008,715	6,119,442
Total stockholders' equity	6,528,335	5,952,492
Total liabilities and stockholders' equity	18,124,648	17,299,581
Nonvoting Common Stock [Member]
Stockholders' equity:
Common stock	176	0
Consolidated statement of change in equity
Net earnings	0	0	0
Series N Non-Voting Common Stock Dividends	0
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)
U-Haul Holding Company [Member]
ASSETS:
Cash and cash equivalents	1,662,790	2,085,447
Investments in subsidiaries	4,575,886	4,308,020
Related party assets	2,482,280	1,842,445
Other assets	403,191	178,691
Total assets	9,124,147	8,414,603
Liabilities:
Other Liabilities	2,601,631	2,463,308
Stockholders' equity:
Preferred stock	0	0
Common stock	10,497	10,497
Additional paid-in capital	453,853	454,029
Accumulated other comprehensive loss	(272,865)	45,187
Consolidated statement of change in equity
Beginning of period	6,119,232	5,025,358
Net earnings	922,998	1,123,286	610,856
Dividends	(19,608)	(29,412)
Series N Non-Voting Common Stock Dividends	(14,117)	0
End of period	7,008,505	6,119,232	$ 5,025,358
Total stockholders' equity	6,522,516	5,951,295
Total liabilities and stockholders' equity	9,124,147	8,414,603
U-Haul Holding Company [Member] | Nonvoting Common Stock [Member]
Stockholders' equity:
Common stock	176	0
U-Haul Holding Company [Member] | Common Stock in Treasury [Member]
Consolidated statement of change in equity
Cost of shares in treasury	(525,653)	(525,653)
U-Haul Holding Company [Member] | Preferred Stock in Treasury [Member]
Consolidated statement of change in equity
Cost of shares in treasury	$ (151,997)	$ (151,997)