Schedule II - U-Haul Holding Company and Consolidated Subsidiaries, Valuation and Qualifying Accounts (Details) - U-Haul Holding Company [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Allowance for obsolescence (deducted from inventory) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 929	$ 1,080	$ 1,416
Deductions		(151)	(336)
Balance at year end		929	1,080
Allowance for LIFO (deducted from inventory) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	47,065	37,400	21,832
Additions charged to cost and expenses		9,665	15,568
Deductions	(734)
Balance at year end	$ 46,331	$ 47,065	$ 37,400