Intangible Assets and Goodwill - Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2020	Jul. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,201,093	$ 1,216,035
Accumulated Amortization	$ 287,482	245,224
Dealer network/customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	18 years
Cost	$ 740,172	750,641
Accumulated Amortization	$ 217,913	191,017
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	17 years
Cost	$ 265,889	268,778
Accumulated Amortization	$ 40,511	34,518
Design technology and other intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining life	9 years
Cost	$ 195,032	196,616
Accumulated Amortization	$ 29,058	$ 19,689