Intangible Assets and Goodwill - Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	Jan. 31, 2021	Jul. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,409,034	$ 1,255,441
Accumulated amortization	399,603	340,717
Dealer networks/customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	869,055	766,198
Accumulated amortization	290,948	252,320
Trademarks
Finite-Lived Intangible Assets [Line Items]
Cost	313,903	275,775
Accumulated amortization	55,195	47,743
Design technology and other intangibles
Finite-Lived Intangible Assets [Line Items]
Cost	219,876	213,468
Accumulated amortization	52,245	40,654
Backlog
Finite-Lived Intangible Assets [Line Items]
Cost	4,800	0
Accumulated amortization	1,157	0
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Cost	1,400	0
Accumulated amortization	$ 58	$ 0