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, 2023	Mar. 31, 2022	Mar. 31, 2021
Allowance for doubtful accounts (deducted from trade receivable) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year		$ 4,421	$ 535
Additions charged to cost and expenses			2,179
Additions charged to other accounts			2,680
Deductions			(973)
Balance at year end			4,421
Allowance for obsolescence (deducted from inventory) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 1,080	1,416	3,063
Additions charged to cost and expenses	0	0	0
Additions charged to other accounts	0	0	0
Deductions	(151)	(336)	(1,647)
Balance at year end	929	1,080	1,416
Allowance for LIFO (deducted from inventory) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	37,400	21,832	18,886
Additions charged to cost and expenses	9,665	15,568	2,946
Additions charged to other accounts	0	0	0
Deductions	0	0	0
Balance at year end	$ 47,065	37,400	21,832
Allowance for probable losses (deducted from mortgage loans) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year		$ 448	493
Additions charged to cost and expenses			0
Additions charged to other accounts			0
Deductions			(45)
Balance at year end			$ 448