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Components of Amortizable Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 12 Months Ended
May 01, 2014
Oct. 31, 2013
Aug. 30, 2013
Jul. 31, 2014
Jul. 31, 2013
Finite-Lived Intangible Assets [Line Items]          
Cost       $ 162,422 $ 127,472
Accumulated Amortization       42,639 29,719
Dealer Networks
          
Finite-Lived Intangible Assets [Line Items]          
Weighted Average Remaining Life in Years 12 years 12 years 8 years 9 years  
Cost       90,760 67,000
Accumulated Amortization       27,102 19,121
Non-Compete Agreements
          
Finite-Lived Intangible Assets [Line Items]          
Weighted Average Remaining Life in Years 5 years   2 years 2 years  
Cost       4,710 4,130
Accumulated Amortization       3,283 2,375
Trademarks
          
Finite-Lived Intangible Assets [Line Items]          
Weighted Average Remaining Life in Years 20 years 20 years 20 years 21 years  
Cost       43,882 35,042
Accumulated Amortization       5,479 3,843
Design Technology And Other Intangibles
          
Finite-Lived Intangible Assets [Line Items]          
Weighted Average Remaining Life in Years       10 years  
Cost       23,070 21,300
Accumulated Amortization       $ 6,775 $ 4,380