Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		0 Months Ended		3 Months Ended	0 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	May 01, 2014	Oct. 31, 2013	Apr. 30, 2014	Aug. 30, 2013	Jan. 05, 2015
Business Acquisition [Line Items]
Payment to acquire business, net	$ 49,265	$ 33,487
K.Z. Inc.
Business Acquisition [Line Items]
Payment to acquire business			53,405
Asset purchase agreement date			May 01, 2014
Amortizable intangible assets, weighted average useful life			13 years 10 months 24 days
Purchase price adjustment			2,915
Payment to acquire business, net			55,324
Bison
Business Acquisition [Line Items]
Payment to acquire business				16,718	16,914
Asset purchase agreement date				Oct. 31, 2013
Amortizable intangible assets, weighted average useful life				13 years 3 months 18 days
Additional cash payment					196
Livin' Lite
Business Acquisition [Line Items]
Asset purchase agreement date						Aug. 30, 2013
Amortizable intangible assets, weighted average useful life						10 years 2 months 12 days
Payment to acquire business, net						16,769
Cruiser RV, LLC and DRV, LLC
Business Acquisition [Line Items]
Payment to acquire business							47,412
Asset purchase agreement date							Dec. 31, 2014
Amortizable intangible assets, weighted average useful life							13 years 10 months 24 days
Payment to acquire business, net							$ 46,350
Dealer Networks
Business Acquisition [Line Items]
Intangible assets amortization period	9 years		12 years	12 years		8 years	12 years
Amortizable intangible assets, amortization method	Accelerated cash flow basis
Trademarks
Business Acquisition [Line Items]
Intangible assets amortization period	20 years		20 years	20 years		20 years	20 years
Amortizable intangible assets, amortization method	Straight line basis
Non-Compete Agreements
Business Acquisition [Line Items]
Intangible assets amortization period	2 years		5 years			2 years
Amortizable intangible assets, amortization method	Straight line basis
Backlog
Business Acquisition [Line Items]
Intangible assets amortization period			2 months	42 days		42 days	42 days
Amortizable intangible assets, amortization method	Straight line basis
Design Technology Assets
Business Acquisition [Line Items]
Intangible assets amortization period						5 years
Amortizable intangible assets, amortization method	Straight line basis