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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Jul. 31, 2014
Segment
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
May 01, 2014
Trademarks
Oct. 31, 2013
Trademarks
Aug. 30, 2013
Trademarks
Jul. 31, 2014
Trademarks
May 01, 2014
Dealer Networks
Oct. 31, 2013
Dealer Networks
Aug. 30, 2013
Dealer Networks
Jul. 31, 2014
Dealer Networks
Aug. 30, 2013
Design Technology Assets
May 01, 2014
Non-Compete Agreements
Aug. 30, 2013
Non-Compete Agreements
Jul. 31, 2014
Non-Compete Agreements
Jul. 31, 2014
Any occurrence after March 31, 2014
Jul. 31, 2014
Continuing Operations
Selling, General And Administrative Expenses
Jul. 31, 2013
Continuing Operations
Selling, General And Administrative Expenses
Jul. 31, 2012
Continuing Operations
Selling, General And Administrative Expenses
Jul. 31, 2014
Maximum
Jul. 31, 2014
Maximum
Trademarks
Jul. 31, 2014
Maximum
Dealer Networks
Jul. 31, 2014
Maximum
Design Technology Assets
Jul. 31, 2014
Maximum
Non-Compete Agreements
Jul. 31, 2014
Maximum
Building and Building Improvements
Jul. 31, 2014
Maximum
Machinery and Equipment
Jul. 31, 2014
Minimum
Jul. 31, 2014
Minimum
Trademarks
Jul. 31, 2014
Minimum
Design Technology Assets
Jul. 31, 2014
Minimum
Non-Compete Agreements
Jul. 31, 2014
Minimum
Building and Building Improvements
Jul. 31, 2014
Minimum
Machinery and Equipment
Jul. 31, 2014
Held By One Financial Institution
Jul. 31, 2013
Held By One Financial Institution
Jul. 31, 2014
Held At Various Other Financial Institutions
Jul. 31, 2013
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 $ 289,336 $ 236,601 $ 218,642 $ 215,435                                                           $ 279,511 $ 217,965 $ 9,825 $ 18,636
Property, plant and equipment, estimated useful life                                                   39 years 10 years         10 years 3 years        
Depreciation expense 12,850 13,950 13,843                             2,542 2,783 2,713                                  
Intangible assets amortization period         20 years 20 years 20 years 21 years 12 years 12 years 8 years 9 years 5 years 5 years 2 years 2 years           25 years 12 years 15 years 15 years       20 years 2 years 2 years            
Self-insured retention for products liability and personal injury matters                                 1,000       7,500             1,000                  
Excess liability insurance 50,000                                                                        
Advertising costs $ 9,492 $ 8,794 $ 6,989                                                                    
Maximum percentage of tax benefits realized upon ultimate settlement 50.00%                                                                        
Antidilutive stock options, unvested restricted stock and restricted stock units outstanding 0 0 412,000