Related Party Costs and Expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Related party cost and expense:
Related party costs and expenses	$ 12,293	$ 11,760	$ 43,663	$ 41,685
Sac Holdings [Member]
Related party cost and expense:
U-Haul lease expenses	654	655	1,964	1,965
U-Haul commission expenses	10,905	10,414	39,131	37,341
Private Mini [Member]
Related party cost and expense:
U-Haul commission expenses	$ 734	$ 691	$ 2,568	$ 2,379