Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended		9 Months Ended			1 Months Ended		9 Months Ended	1 Months Ended		9 Months Ended	1 Months Ended		9 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended						1 Months Ended							1 Months Ended	11 Months Ended
	Oct. 31, 2013	Aug. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Jul. 31, 2013	Oct. 31, 2013 Dealer Networks	Aug. 30, 2013 Dealer Networks	Apr. 30, 2014 Dealer Networks	Oct. 31, 2013 Trademarks	Aug. 30, 2013 Trademarks	Apr. 30, 2014 Trademarks	Oct. 31, 2013 Backlog	Aug. 30, 2013 Backlog	Apr. 30, 2014 Backlog	Aug. 30, 2013 Design Technology Assets	Apr. 30, 2014 Design Technology Assets	Aug. 30, 2013 Non-Compete Agreements	Apr. 30, 2014 Non-Compete Agreements	Aug. 30, 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	Dec. 20, 2012 Buses	Oct. 03, 2012 Buses	Dec. 20, 2012 Buses Dealer Networks	Oct. 03, 2012 Buses Dealer Networks	Dec. 20, 2012 Buses Trademarks	Oct. 03, 2012 Buses Trademarks	Dec. 20, 2012 Buses Backlog	Oct. 31, 2013 Bison	Apr. 30, 2014 Bison	Oct. 31, 2013 Bison Dealer Networks	Oct. 31, 2013 Bison Trademarks	Oct. 31, 2013 Bison Backlog
Business Acquisition [Line Items]
Payment to acquire business																									$ 6,804	$ 3,914						$ 16,718	$ 16,914
Asset purchase agreement date																			Aug. 30, 2013							Oct. 03, 2012						Oct. 31, 2013
Additional cash payment																																	196
Amortizable intangible assets, weighted average useful life	13 years 3 months 18 days	10 years 2 months 12 days
Amortizable intangible assets, amortization period						12 years	8 years	9 years	20 years	20 years	21 years	42 days	42 days		5 years		2 years	1 year
Amortizable intangible assets, amortization method								Accelerated cash flow basis			Straight line basis			Straight line basis		Straight line basis		Straight line basis
Payment to acquire business, net			33,683	10,718															16,769
Business acquisition allocated to inventory																									804	915
Business acquisition allocated to property and equipment																			137						630	331						625
Business acquisition allocated to Certain liabilities																									225
Business acquisition allocated to goodwill			253,876		238,103														9,113						4,495	768						6,660
Business acquisition allocated to amortizing intangible asset																				$ 3,200	$ 1,500	$ 110	$ 1,100	$ 130			$ 410	$ 900	$ 670	$ 1,000	$ 20			$ 7,400	$ 1,800	$ 140