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Concentration of Risk - Additional Information (Detail) (Freedom Roads, LLC)
12 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Net Sales
     
Concentration Risk [Line Items]      
Concentration risk percentage 17.00% 17.00% 14.00%
Accounts Receivable
     
Concentration Risk [Line Items]      
Concentration risk percentage 21.00% 24.00%