Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands			9 Months Ended
	May. 01, 2015	Jan. 05, 2015	Apr. 30, 2016	Jul. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Cost			$ 222,027	$ 226,252
Accumulated Amortization			$ 70,636	57,234
Dealer Network/Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years			9 years
Cost			$ 143,860	143,860
Accumulated Amortization			$ 50,745	37,194
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	15 years	20 years	18 years
Cost			$ 55,317	55,282
Accumulated Amortization			$ 9,516	7,608
Design Technology And Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years			9 years
Cost			$ 22,400	22,400
Accumulated Amortization			$ 10,195	8,168
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years			3 years
Cost			$ 450	4,710
Accumulated Amortization			$ 180	$ 4,264