Schedule II - AMERCO and Consolidated Subsidiaries, Valuation and Qualifying Accounts (Details) - Amerco [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
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	$ 549
Additions charged to cost and expenses	5,283	2,179	731
Additions charged to other accounts	1,679	2,680	0
Deductions	(2,734)	(973)	(745)
Balance at year end	8,649	4,421	535
Allowance for obsolescence (deducted from inventory) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	1,416	3,063	2,322
Additions charged to cost and expenses	0	0	741
Additions charged to other accounts	0	0	0
Deductions	(336)	(1,647)	0
Balance at year end	1,080	1,416	3,063
Allowance for LIFO (deducted from inventory) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	21,832	18,886	18,987
Additions charged to cost and expenses	15,568	2,946	0
Additions charged to other accounts	0	0	0
Deductions	0	0	(101)
Balance at year end	37,400	21,832	18,886
Allowance for probable losses (deducted from mortgage loans) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	448	493	493
Additions charged to cost and expenses	0	0	0
Additions charged to other accounts	0	0	0
Deductions	0	(45)	0
Balance at year end	$ 448	$ 448	$ 493