Schedule of Major Classifications of Inventories (Detail) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Inventory [Line Items]
Work in process	$ 51,556	$ 49,537
Raw materials	133,482	122,150
Chassis	37,739	45,231
Subtotal	276,515	244,342
Excess of FIFO costs over LIFO costs	(30,400)	(27,988)
Total inventories	246,115	216,354
Recreational vehicles
Inventory [Line Items]
Finished products	35,693	$ 27,424
Other
Inventory [Line Items]
Finished products	$ 18,045