Related Party Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Mar. 31, 2013
Related party assets:
Related party assets	$ 170,038		$ 182,035
SAC Holdings
Related party assets:
U-Haul interest receivable	4,293		14,483
U-Haul receivables	18,259		22,336
SAC Holding
Related party assets:
Notes receivable	71,721		72,397
Private Mini
Related party assets:
U-Haul notes, receivables and interest	72,365		68,593
Mercury
Related party assets:
U-Haul receivables	5,472		3,640
Insurance group
Related party assets:
Other	$ (2,072)	[1]	$ 586	[1]

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