Related Party Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Related party assets:
U-Haul receivables	$ 4,177		$ 14,803
Related party assets	169,624		182,035
Sac Holdings [Member]
Related party assets:
Notes receivable	71,464		72,397
U-Haul interest receivable	4,376		14,483
U-Haul receivables	19,418		22,336
Private Mini [Member]
Related party assets:
U-Haul notes, receivables and interest	68,451		68,593
Mercury [Member]
Related party assets:
U-Haul receivables	5,930		3,640
Insurance Subsidiaries [Member]
Related party assets:
Other	$ (15)	[1]	$ 586	[1]

[1] Timing differences for intercompany balances with insurance sibsidiaries.