Components of Amortizable Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	Aug. 30, 2013	Oct. 31, 2013	Jul. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Cost		$ 143,452	$ 127,472
Accumulated Amortization		32,557	29,719
Dealer Networks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	8 years	9 years
Cost		78,000	67,000
Accumulated Amortization		20,844	19,121
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	2 years	2 years
Cost		4,260	4,130
Accumulated Amortization		2,592	2,375
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years	20 years	21 years
Cost		38,542	35,042
Accumulated Amortization		4,214	3,843
Design Technology And Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life in Years		11 years
Cost		22,650	21,300
Accumulated Amortization		$ 4,907	$ 4,380