Schedule of Major Classifications of Inventories (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Jul. 31, 2015
Inventory [Line Items]
Work in process	$ 97,872	$ 51,556
Raw materials	173,362	133,482
Chassis	102,686	37,739
Subtotal	434,004	276,515
Excess of FIFO costs over LIFO costs	(30,135)	(30,400)
Total inventories	403,869	246,115
Recreational vehicles
Inventory [Line Items]
Finished products	39,943	35,693
Other
Inventory [Line Items]
Finished products	$ 20,141	$ 18,045