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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Jul. 31, 2012
Payables and Accruals [Abstract]    
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
Accounts payable and accrued liabilities, current, total $ 136,648 $ 102,677