Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Cost	$ 569,727	$ 572,327
Accumulated Amortization	$ 181,379	128,861
Dealer Network/Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	16 years
Cost	$ 404,960	404,960
Accumulated Amortization	$ 147,077	101,795
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	17 years
Cost	$ 146,117	147,617
Accumulated Amortization	$ 24,364	17,570
Design Technology and Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	7 years
Cost	$ 18,200	19,300
Accumulated Amortization	$ 9,555	9,203
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	1 year
Cost	$ 450	450
Accumulated Amortization	$ 383	$ 293