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Accounts Payable and Accrued Liabilities (Tables)
12 Months Ended
Jul. 31, 2013
Payables and Accruals [Abstract]  
Schedule of accounts payable and accrued liabilities

     Years Ended July 31,    
     2013    2012
Trade accounts payable
              $ 34,488          $ 16,353   
Accounts payable to sellers
                 36,073             36,153   
Accrued insurance
                 6,048             5,686   
Accrued compensation and benefits
                 21,978             16,791   
Buyer deposits and prepayments
                 25,384             18,061   
Other accrued liabilities
                 12,677             9,633   
 
              $ 136,648          $ 102,677