Accounting Policies (Inventories, net) (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Mar. 31, 2017
Inventory, Net [Abstract]
Truck and trailer parts and accessories (a)	[1]	$ 83,335	$ 71,918
Hitches and towing components (b)	[2]	18,627	17,799
Moving supplies and propane (b)	[2]	9,370	9,112
Subtotal		111,332	98,829
Less: LIFO reserves		(16,126)	(14,340)
Less: excess and obsolete reserves		(5,329)	(2,050)
Total		$ 89,877	$ 82,439

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

[2] Primarily held for retail sales