Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Related party cost and expense:
Related party expenses, total	$ 13,016	$ 12,293	$ 45,621	$ 43,663
Sac Holdings [Member]
Related party cost and expense:
U-Haul lease expenses	654	654	1,962	1,964
U-Haul commission expenses	11,521	10,905	40,780	39,131
Private Mini [Member]
Related party cost and expense:
U-Haul commission expenses	$ 841	$ 734	$ 2,879	$ 2,568