Related Party Costs and Expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Related party costs and expenses:
Related party expenses, total	$ 10,372	$ 10,992	$ 36,584	$ 34,906
SAC Holdings
Related party costs and expenses:
U-Haul lease expenses	655	636	1,971	1,762
U-Haul commission expenses	9,142	9,764	32,531	31,146
Private Mini
Related party costs and expenses:
U-Haul commission expenses	$ 575	$ 592	$ 2,082	$ 1,998