Intangible Assets and Goodwill - Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2021	Jul. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,406,004	$ 1,255,441
Accumulated amortization	429,743	340,717
Dealer networks/customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	867,483	766,198
Accumulated amortization	309,523	252,320
Trademarks
Finite-Lived Intangible Assets [Line Items]
Cost	313,309	275,775
Accumulated amortization	59,037	47,743
Design technology and other intangibles
Finite-Lived Intangible Assets [Line Items]
Cost	219,012	213,468
Accumulated amortization	57,537	40,654
Backlog
Finite-Lived Intangible Assets [Line Items]
Cost	4,800	0
Accumulated amortization	3,471	0
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Cost	1,400	0
Accumulated amortization	$ 175	$ 0