Schedule of Major Classifications of Inventories (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Jul. 31, 2016
Inventory [Line Items]
Work in process	$ 107,442	$ 97,872
Raw materials	183,500	173,362
Chassis	84,579	102,686
Total	447,262	434,004
Excess of FIFO costs over LIFO costs	(30,135)	(30,135)
Total inventories, net	417,127	403,869
Recreational vehicles
Inventory [Line Items]
Finished goods	48,128	39,943
Other
Inventory [Line Items]
Finished goods	$ 23,613	$ 20,141