Schedule of Major Classifications of Inventories (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Jul. 31, 2015
Inventory [Line Items]
Work in process	$ 56,021	$ 51,556
Raw materials	138,896	133,482
Chassis	59,245	37,739
Total	306,577	276,515
Excess of FIFO costs over LIFO costs	(31,125)	(30,400)
Total inventories, net	275,452	246,115
Recreational vehicles
Inventory [Line Items]
Finished goods	29,833	35,693
Other
Inventory [Line Items]
Finished goods	$ 22,582	$ 18,045