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Components of Amortizable Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Cost $ 127,472 $ 136,626
Accumulated Amortization 29,719 22,399
Dealer networks
    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life in Years 9 years  
Cost 67,000 72,230
Accumulated Amortization 19,121 13,343
Non-compete agreements
    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life in Years 2 years  
Cost 4,130 6,321
Accumulated Amortization 2,375 3,678
Trademarks
    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life in Years 22 years  
Cost 35,042 36,775
Accumulated Amortization 3,843 2,522
Design Technology And Other Intangibles
    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life in Years 11 years  
Cost 21,300 21,300
Accumulated Amortization $ 4,380 $ 2,856