Schedule of Major Classifications of Inventories (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jul. 31, 2017
Inventory [Line Items]
Work in process	$ 130,032	$ 117,319
Raw materials	242,730	214,518
Chassis	114,234	109,555
Subtotal	552,398	494,158
Excess of FIFO costs over LIFO costs	(35,070)	(33,670)
Total inventories, net	517,328	460,488
Recreational vehicles
Inventory [Line Items]
Finished goods	40,305	24,904
Other
Inventory [Line Items]
Finished goods	$ 25,097	$ 27,862