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Goodwill And Other Intangible Assets (Components Of Amortizable Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jan. 31, 2012
years
Jul. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
Cost $ 136,520 $ 138,010
Accumulated Amortization 16,889 12,755
Dealer Network [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life in Years 11  
Cost 72,230 72,230
Accumulated Amortization 9,778 6,154
Non-Compete Agreements [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life in Years 4  
Cost 6,321 6,851
Accumulated Amortization 3,253 3,300
Trademarks [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life in Years 23  
Cost 36,669 36,669
Accumulated Amortization 1,764 1,008
Design Technology And Other Intangibles [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life in Years 13  
Cost 21,300 22,260
Accumulated Amortization $ 2,094 $ 2,293