Related Party Transactions (Related Party Costs and Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Related party cost and expense:
Related party expenses, total	$ 16,441	$ 15,625
Sac Holdings [Member]
Related party cost and expense:
U-Haul lease expenses	688	654
U-Haul commission expenses	14,701	13,991
Private Mini [Member]
Related party cost and expense:
U-Haul commission expenses	$ 1,052	$ 980