Summary of Preliminary Fair Value Assigned to Net Assets Acquired (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended							1 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Jul. 31, 2013	Oct. 31, 2013 Bison	Oct. 31, 2013 Bison Dealer Networks	Oct. 31, 2013 Bison Trademarks	Oct. 31, 2013 Bison Backlog	Aug. 30, 2013 Livin' Lite	Oct. 31, 2013 Livin' Lite	Aug. 30, 2013 Livin' Lite Dealer Networks	Aug. 30, 2013 Livin' Lite Trademarks	Aug. 30, 2013 Livin' Lite Backlog	Aug. 30, 2013 Livin' Lite Design Technology Assets	Aug. 30, 2013 Livin' Lite Non-Compete Agreements
Business Acquisition [Line Items]
Cash								$ 247
Current assets				3,995
Other current assets								3,626
Property, plant and equipment				625				137
Goodwill	253,276		238,103	6,060				9,113
Amortizable intangible assets					7,800	2,000	140			3,200	1,500	110	1,100	130
Current liabilities				(3,902)				(2,147)
Total fair value of net assets acquired				16,718				17,016	17,056
Less cash acquired								(247)
Total cash paid for acquisition, less cash acquired	$ 33,774	$ 3,914						$ 16,769