Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,216,485	$ 569,727
Accumulated Amortization	$ 245,674	181,379
Dealer Network/Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	18 years
Cost	$ 750,641	404,960
Accumulated Amortization	$ 191,017	147,077
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	18 years
Cost	$ 268,778	146,117
Accumulated Amortization	$ 34,518	24,364
Design Technology and Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	9 years
Cost	$ 196,616	18,200
Accumulated Amortization	19,689	9,555
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Cost	450	450
Accumulated Amortization	$ 450	$ 383