Schedule of Major Classifications of Inventories (Detail) - USD ($) $ in Thousands	Oct. 31, 2015	Jul. 31, 2015
Inventory [Line Items]
Work in process	$ 55,368	$ 51,556
Raw materials	132,480	133,482
Chassis	50,008	37,739
Total	301,770	276,515
Excess of FIFO costs over LIFO costs	(30,400)	(30,400)
Total inventories, net	271,370	246,115
Recreational vehicles
Inventory [Line Items]
Finished goods	48,111	35,693
Other
Inventory [Line Items]
Finished goods	$ 15,803	$ 18,045