Related Party Costs and Expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Related party costs and expenses:
U-Haul lease expenses	$ 655	$ 503	$ 1,316	$ 1,126
U-Haul commission expenses	13,267	12,142	24,896	22,788
Related party expenses, total	13,922	12,645	26,212	23,914
SAC Holdings
Related party costs and expenses:
U-Haul lease expenses	655	503	1,316	1,126
U-Haul commission expenses	12,455	11,379	23,389	21,382
Private Mini
Related party costs and expenses:
U-Haul commission expenses	$ 812	$ 763	$ 1,507	$ 1,406