Schedule V, AMERCO and Consolidated Subsidiaries, Supplemental Information (for Property-Casualty Insurance Operations) (Details) (Consolidated property casualty entity, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012
Consolidated property casualty entity
Supplemental information for property, casualty insurance underwriters:
Deferred policy acquisition costs
Reserves for unpaid claims and claims adjustment expense	295,126		330,093		382,328
Discount if any, deducted
Unearned premiums
Net earned premiums (1)	41,052	[1],[2]	34,342	[1],[3],[4]	32,631	[1],[3],[4]
Net investment income (2)	10,057		8,976		9,664
Claim and claim adjustment expenses incurred related to current year	9,861		8,962		9,297
Claim and claim adjustment expenses incurred related to prior year	1,652		7,036		56,445
Amortization of deferred policy acquisition costs
Paid claims and claim adjustment expense	6,576		20,807		16,319
Net premiums written (1)	$ 41,065	[1],[3],[5]	$ 34,378	[1],[3],[4]	$ 32,627	[1],[6],[7]

[1] The earned and written premiums are reported net of intersegment transactions. There were no earned premiums eliminated for the years ended December 31, 2013, 2012 and 2011, respectively.

[2] Balances are reported net of inter-segment transactions

[3] Eliminate intercompany lease / interest income

[4] Eliminate intercompany premiums

[5] Elimination of preferred stock dividend paid to affiliate

[6] Balance for the period ended December 31, 2013

[7] Eliminate intercompany investments