Related Party Costs and Expenses (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Related Party Cost and Expense [Abstract]
Related party expenses, total	$ 52,552	$ 46,461	$ 44,120
Sac Holdings [Member]
Related Party Cost and Expense [Abstract]
U-Haul lease expenses	2,619	2,626	2,430
U-Haul commission expenses	46,886	41,185	39,167
Private Mini [Member]
Related Party Cost and Expense [Abstract]
U-Haul commission expenses	$ 3,047	$ 2,650	$ 2,523