Related Party Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Mar. 31, 2013
Related party assets:
Related party assets	$ 151,127		$ 182,035
SAC Holdings
Related party assets:
Notes receivable	72,181		72,397
U-Haul interest receivable	4,111		14,483
U-Haul receivables	10,651		22,336
Private Mini
Related party assets:
U-Haul notes, receivables and interest	68,225		68,593
Mercury
Related party assets:
U-Haul receivables	2,275		3,640
Insurance group
Related party assets:
Other	$ (6,316)	[1]	$ 586	[1]

[1] Timing difference for intercompany balances with insurance subsidiaries and a mortgage loan for $4.3 million with Repwest