Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended		6 Months Ended			1 Months Ended		6 Months Ended	1 Months Ended		6 Months Ended	1 Months Ended				6 Months Ended	1 Months Ended							1 Months Ended				1 Months Ended
	Oct. 31, 2013	Aug. 30, 2013	Jan. 31, 2014	Jan. 31, 2013	Jul. 31, 2013	Oct. 31, 2013 Trademarks	Aug. 30, 2013 Trademarks	Jan. 31, 2014 Trademarks	Oct. 31, 2013 Dealer Networks	Aug. 30, 2013 Dealer Networks	Jan. 31, 2014 Dealer Networks	Oct. 31, 2013 Backlog	Aug. 30, 2013 Backlog	Aug. 30, 2013 Design Technology Assets	Aug. 30, 2013 Non-Compete Agreements	Jan. 31, 2014 Non-Compete Agreements	Dec. 20, 2012 Buses	Oct. 03, 2012 Buses	Dec. 20, 2012 Buses Trademarks	Oct. 03, 2012 Buses Trademarks	Dec. 20, 2012 Buses Dealer Networks	Oct. 03, 2012 Buses Dealer Networks	Dec. 20, 2012 Buses Backlog	Oct. 31, 2013 Bison	Oct. 31, 2013 Bison Trademarks	Oct. 31, 2013 Bison Dealer Networks	Oct. 31, 2013 Bison Backlog	Aug. 30, 2013 Livin' Lite	Aug. 30, 2013 Livin' Lite Trademarks	Aug. 30, 2013 Livin' Lite Dealer Networks	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]
Payment to acquire business																								$ 16,718				$ 17,016
Asset purchase agreement date																		Oct. 03, 2012						Oct. 31, 2013				Aug. 30, 2013
Decrease in value of intangible assets								200			400
Increase in goodwill			600
Amortizable intangible assets, weighted average useful life	13 years 3 months 18 days	10 years 2 months 12 days
Amortizable intangible assets, amortization period						20 years	20 years	21 years	12 years	8 years	9 years	42 days	42 days	5 years	2 years	2 years
Amortizable intangible assets, amortization method						Straight line basis	Straight line basis		Accelerated cash flow basis	Accelerated cash flow basis		Straight line basis	Straight line basis	Straight line basis	Straight line basis
Payment to acquire business, net			33,487	10,718																								16,769
Payment to acquire business																	6,804	3,914
Business acquisition allocated to inventory																	804	915
Business acquisition allocated to property and equipment																	630	331						625				137
Business acquisition allocated to Certain liabilities																	225
Business acquisition allocated to goodwill			253,876		238,103												4,495	768						6,660				9,113
Business acquisition allocated to amortizing intangible asset																			$ 670	$ 1,000	$ 410	$ 900	$ 20		$ 1,800	$ 7,400	$ 140		$ 1,500	$ 3,200	$ 110	$ 1,100	$ 130