Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Cost	$ 572,327	$ 588,327
Accumulated Amortization	$ 128,861	80,936
Dealer Network/Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	16 years
Cost	$ 404,960	404,960
Accumulated Amortization	$ 101,795	55,191
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	18 years
Cost	$ 147,617	148,117
Accumulated Amortization	$ 17,570	10,539
Design Technology and Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	8 years
Cost	$ 19,300	22,400
Accumulated Amortization	$ 9,203	10,870
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	2 years
Cost	$ 450	450
Accumulated Amortization	$ 293	203
Backlog
Finite-Lived Intangible Assets [Line Items]
Cost		12,400
Accumulated Amortization		$ 4,133