Schedule II, AMERCO and Consolidated Subsidiaries, Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Allowance for doubtful accounts (deducted from trade receivable)
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 994	$ 1,128	$ 1,336
Additions charged to cost and expenses	958	1,184	1,485
Additions charged to other accounts
Deductions	(994)	(1,318)	(1,693)
Balance at year end	958	994	1,128
Allowance for obsolescence (deducted from inventory)
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	1,711	730	595
Additions charged to cost and expenses	776	981	135
Additions charged to other accounts
Deductions
Balance at year end	2,487	1,711	730
Allowance for LIFO (deducted from inventory)
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	14,693	14,541	13,294
Additions charged to cost and expenses	95	152	1,247
Additions charged to other accounts
Deductions
Balance at year end	14,788	14,693	14,541
Allowance for probable losses (deducted from mortgage loans)
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	370	370	370
Additions charged to cost and expenses
Additions charged to other accounts
Deductions
Balance at year end	$ 370	$ 370	$ 370