Accounting Policies (Inventories, net) (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Mar. 31, 2016
Inventory, Net [Abstract]
Truck and trailer parts and accessories (a)	[1]	$ 71,918	$ 68,665
Hitches and towing components (b)	[2]	17,799	17,483
Moving supplies and propane (b)	[2]	9,112	8,668
Subtotal		98,829	94,816
Less: LIFO reserves		(14,340)	(13,463)
Less: excess and obsolete reserves		(2,050)	(1,597)
Total		$ 82,439	$ 79,756

[1] Primarily held for internal usage, including equipment manufacturing and repair

[2] Primarily held for retail sales