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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jul. 31, 2013
Segment
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2013
Trademarks
Jul. 31, 2013
Dealer networks
Jul. 31, 2013
Non-compete agreements
Jul. 31, 2013
Continuing Operations
Selling, general and administrative expenses
Jul. 31, 2012
Continuing Operations
Selling, general and administrative expenses
Jul. 31, 2011
Continuing Operations
Selling, general and administrative expenses
Sep. 30, 2011
Minimum
Jul. 31, 2013
Minimum
Jul. 31, 2013
Minimum
Trademarks
Jul. 31, 2013
Minimum
Design technology assets
Jul. 31, 2013
Minimum
Non-compete agreements
Jul. 31, 2013
Minimum
Buildings and improvements
Jul. 31, 2013
Minimum
Machinery and equipment
Jul. 31, 2013
Maximum
Jul. 31, 2013
Maximum
Trademarks
Jul. 31, 2013
Maximum
Dealer networks
Jul. 31, 2013
Maximum
Design technology assets
Jul. 31, 2013
Maximum
Non-compete agreements
Jul. 31, 2013
Maximum
Buildings and improvements
Jul. 31, 2013
Maximum
Machinery and equipment
Jul. 31, 2013
Held By One Financial Institution
Jul. 31, 2012
Held By One Financial Institution
Jul. 31, 2013
Held At Various Other Financial Institutions
Jul. 31, 2012
Held At Various Other Financial Institutions
Summary Of Significant Accounting Policies [Line Items]                                                        
Number of reportable segments 2                                                      
Cash equivalents maturity period                                   3 months                    
Cash and cash equivalents $ 236,601 $ 218,642 $ 215,435 $ 247,751                                         $ 217,965 $ 183,615 $ 18,636 $ 35,027
Property, plant and equipment, estimated useful life                               10 years 3 years           39 years 10 years        
Depreciation expense 13,950 13,843 13,747         2,783 2,713 2,658                                    
Intangible assets amortization period         22 years 9 years 2 years           20 years 5 years 5 years       25 years 12 years 15 years 15 years            
Self-insured retention for products liability and personal injury matters 5,000                                                      
Self insurance retention for bus related matters 7,500                                                      
Excess liability insurance 50,000                                                      
Advertising costs $ 8,794 $ 6,989 $ 6,168                                                  
Maximum percentage of tax benefits realized upon ultimate settlement 50.00%                                                      
Option vesting period                       3 years           5 years                    
Antidilutive stock options, unvested restricted stock and restricted stock units outstanding 0 412,000 729,826                                                  
Percentage used to determine whether it is more likely than not that a reporting unit's fair value is less than its carrying amount                     50.00%