Intangible Assets and Goodwill - Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2019	Jul. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,216,209	$ 1,216,035
Accumulated Amortization	$ 269,628	245,224
Dealer network/customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	18 years
Cost	$ 750,734	750,641
Accumulated Amortization	$ 207,348	191,017
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	18 years
Cost	$ 268,811	268,778
Accumulated Amortization	$ 37,824	34,518
Design technology and other intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	9 years
Cost	$ 196,664	196,616
Accumulated Amortization	$ 24,456	$ 19,689