Schedule II - AMERCO and Consolidated Subsidiaries, Valuation and Qualifying Accounts (Details) - Amerco [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Allowance for doubtful accounts (deducted from trade receivable) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 790	$ 958	$ 994
Additions charged to cost and expenses	$ 967	$ 994	$ 958
Additions charged to other accounts
Deductions	$ (1,172)	$ (1,162)	$ (994)
Balance at year end	585	790	958
Allowance for obsolescence (deducted from inventory) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	1,384	$ 2,487	1,711
Additions charged to cost and expenses	$ 213		$ 776
Additions charged to other accounts
Deductions		$ (1,103)
Balance at year end	$ 1,597	1,384	$ 2,487
Allowance for LIFO (deducted from inventory) [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 15,019	14,788	14,693
Additions charged to cost and expenses		$ 231	$ 95
Additions charged to other accounts
Deductions	$ (1,556)
Balance at year end	13,463	$ 15,019	$ 14,788
Allowance for probable losses (deducted from mortgage loans) [Member]
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	$ (2)
Balance at year end	$ 368	$ 370	$ 370