Intangible Assets and Goodwill - Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2020	Jul. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,199,065	$ 1,216,035
Accumulated Amortization	$ 310,807	245,224
Dealer network/customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	17 years
Cost	$ 736,066	750,641
Accumulated Amortization	$ 233,652	191,017
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	17 years
Cost	$ 265,083	268,778
Accumulated Amortization	$ 43,665	34,518
Design technology and other intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	9 years
Cost	$ 197,916	196,616
Accumulated Amortization	$ 33,490	$ 19,689