Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands						12 Months Ended
	May. 01, 2015	Jan. 05, 2015	May. 01, 2014	Oct. 31, 2013	Aug. 30, 2013	Jul. 31, 2015	Jul. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost						$ 226,252	$ 162,422
Accumulated Amortization						$ 57,234	42,639
Dealer Network/Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Years Remaining Life						10 years
Cost						$ 143,860	90,760
Accumulated Amortization						$ 37,194	27,102
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Years Remaining Life	15 years	20 years	20 years	20 years	20 years	19 years
Cost						$ 55,282	43,882
Accumulated Amortization						$ 7,608	5,479
Design Technology And Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted Average Years Remaining Life						9 years
Cost						$ 22,400	23,070
Accumulated Amortization						$ 8,168	6,775
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Weighted Average Years Remaining Life			5 years		2 years	3 years
Cost						$ 4,710	4,710
Accumulated Amortization						$ 4,264	$ 3,283