Related Party Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Mar. 31, 2014
Related party assets:
Related party assets	$ 159,721		$ 169,624
Sac Holdings [Member]
Related party assets:
Notes receivable	71,227		71,464
U-Haul interest receivable	4,444		4,376
U-Haul receivables	13,338		19,418
Private Mini [Member]
Related party assets:
U-Haul notes, receivables and interest	68,010		68,451
Mercury [Member]
Related party assets:
U-Haul receivables	4,042		5,930
Insurance Group [Member]
Related party assets:
Other	$ (1,340)	[1]	$ (15)	[1]

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