Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2019	Jul. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,231,589	$ 569,727
Accumulated Amortization	$ 231,731	181,379
Dealer Network/Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	18 years
Cost	$ 752,718	404,960
Accumulated Amortization	$ 178,376	147,077
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	18 years
Cost	$ 269,515	146,117
Accumulated Amortization	$ 31,222	24,364
Design Technology and Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	10 years
Cost	$ 197,688	18,200
Accumulated Amortization	$ 14,952	9,555
Backlog
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life, Description	Less than 1
Cost	$ 11,218	0
Accumulated Amortization	$ 6,731	0
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	0 years
Cost	$ 450	450
Accumulated Amortization	$ 450	$ 383