Schedule of Major Classifications of Inventories (Detail) - USD ($) $ in Thousands	Jan. 31, 2016	Jul. 31, 2015
Inventory [Line Items]
Work in process	$ 59,506	$ 51,556
Raw materials	139,876	133,482
Chassis	50,597	37,739
Total	305,285	276,515
Excess of FIFO costs over LIFO costs	(30,740)	(30,400)
Total inventories, net	274,545	246,115
Recreational vehicles
Inventory [Line Items]
Finished goods	37,764	35,693
Other
Inventory [Line Items]
Finished goods	$ 17,542	$ 18,045