Related Party Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Mar. 31, 2013
Related party assets:
Related party assets	$ 168,830		$ 182,035
SAC Holdings
Related party assets:
U-Haul interest receivable	4,192		14,483
U-Haul receivables	17,320		22,336
SAC Holding
Related party assets:
Notes receivable	71,960		72,397
Private Mini
Related party assets:
U-Haul notes, receivables and interest	68,772		68,593
Mercury
Related party assets:
U-Haul receivables	2,452		3,640
Insurance group
Related party assets:
Other	$ 4,134	[1]	$ 586	[1]

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