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Accounts Payable and Accrued Liabilities
 12 Months Ended
Jul. 31, 2012
Payables and Accruals [Abstract]  
Accounts Payable and Accrued Liabilities
(8)
   Accounts Payable and Accrued Liabilities
 
Accounts payable and accrued liabilities consist of the following (in thousands):
 
     July 31,   
     2012   2011
Trade accounts payable
              $ 16,353          $ 12,365   
Accounts payable to sellers
                 36,153             42,190   
Accrued insurance
                 5,686             5,494   
Accrued compensation and benefits
                 16,791             15,605   
Buyer deposits and prepayments
                 19,127             14,229   
Other accrued liabilities
                 8,848             11,825   
 
               $ 102,958          $ 101,708   
 
The Company is partially self-insured for certain losses related to general liability, workers’ compensation and auto liability. Accrued insurance liability represents an estimate of the ultimate cost of claims incurred as of the balance sheet date. The estimated liability is not discounted and is established based upon analysis of historical data, including the severity of our frequency of claims, actuarial estimates and is reviewed periodically by management to ensure that the liability is appropriate.