Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Related party cost and expense:
Related party expenses, total	$ 16,980	$ 16,369	$ 32,605	$ 31,370
Sac Holdings [Member]
Related party cost and expense:
U-Haul lease expenses	654	655	1,308	1,310
U-Haul commission expenses	15,268	14,742	29,259	28,226
Private Mini [Member]
Related party cost and expense:
U-Haul commission expenses	$ 1,058	$ 972	$ 2,038	$ 1,834