Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended		12 Months Ended			0 Months Ended		0 Months Ended	3 Months Ended		0 Months Ended		0 Months Ended				0 Months Ended			12 Months Ended						0 Months Ended			12 Months Ended						0 Months Ended		12 Months Ended			0 Months Ended			12 Months Ended					0 Months Ended	12 Months Ended
	Oct. 31, 2013	Aug. 30, 2013	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012	May 01, 2014 K.Z. Inc.	May 01, 2014 K.Z. Inc.	Oct. 31, 2013 Bison	Apr. 30, 2014 Bison	Oct. 31, 2013 Bison	Aug. 30, 2013 Livin' Lite	Aug. 30, 2013 Livin' Lite	Dec. 20, 2012 Buses	Oct. 03, 2012 Buses	Dec. 20, 2012 Buses	Oct. 03, 2012 Buses	May 01, 2014 Dealer Networks	Oct. 31, 2013 Dealer Networks	Aug. 30, 2013 Dealer Networks	Jul. 31, 2014 Dealer Networks	May 01, 2014 Dealer Networks K.Z. Inc.	Oct. 31, 2013 Dealer Networks Bison	Aug. 30, 2013 Dealer Networks Livin' Lite	Dec. 20, 2012 Dealer Networks Buses	Oct. 03, 2012 Dealer Networks Buses	May 01, 2014 Trademarks	Oct. 31, 2013 Trademarks	Aug. 30, 2013 Trademarks	Jul. 31, 2014 Trademarks	May 01, 2014 Trademarks K.Z. Inc.	Oct. 31, 2013 Trademarks Bison	Aug. 30, 2013 Trademarks Livin' Lite	Dec. 20, 2012 Trademarks Buses	Oct. 03, 2012 Trademarks Buses	May 01, 2014 Non-Compete Agreements	Aug. 30, 2013 Non-Compete Agreements	Jul. 31, 2014 Non-Compete Agreements	May 01, 2014 Non-Compete Agreements K.Z. Inc.	Aug. 30, 2013 Non-Compete Agreements Livin' Lite	May 01, 2014 Backlog	Oct. 31, 2013 Backlog	Aug. 30, 2013 Backlog	Jul. 31, 2014 Backlog	May 01, 2014 Backlog K.Z. Inc.	Oct. 31, 2013 Backlog Bison	Aug. 30, 2013 Backlog Livin' Lite	Dec. 20, 2012 Backlog Buses	Aug. 30, 2013 Design Technology Assets	Jul. 31, 2014 Design Technology Assets	Aug. 30, 2013 Design Technology Assets Livin' Lite
Business Acquisition [Line Items]
Payment to acquire business						$ 53,405		$ 16,718	$ 16,914				$ 6,804	$ 3,914
Purchase price adjustment						2,915
Asset purchase agreement date						May 01, 2014		Oct. 31, 2013			Aug. 30, 2013			Oct. 03, 2012
Amortizable intangible assets, weighted average useful life	13 years 3 months 18 days	10 years 2 months 12 days				13 years 10 months 24 days
Intangible assets amortization period																	12 years	12 years	8 years	9 years						20 years	20 years	20 years	21 years						5 years	2 years	2 years			2 months	42 days	42 days						5 years
Amortizable intangible assets, amortization method																				Accelerated basis									Straight line basis								Straight line basis						Straight line basis						Straight line basis
Additional cash payment									196
Payment to acquire business, net			86,092	10,718	170	55,324					16,769
Business acquisition allocated to inventory															804	915
Business acquisition allocated to property and equipment							15,057			625		137			630	331
Business acquisition allocated to Certain liabilities															225
Business acquisition allocated to goodwill			256,579	238,103	245,209		2,703			6,660		9,113			4,495	768
Business acquisition allocated to amortizing intangible asset																					$ 13,160	$ 7,400	$ 3,200	$ 410	$ 900					$ 5,540	$ 1,800	$ 1,500	$ 670	$ 1,000				$ 450	$ 130					$ 420	$ 140	$ 110	$ 20			$ 1,100