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Accounts Receivable, Net (Tables)
12 Months Ended
Jul. 31, 2011
Accounts Receivable, Net [Abstract] 
Accounts Receivable
     July 31,
   
     2011
   2010
Advance charges receivable
              $ 71,961          $ 72,841   
Trade accounts receivable
                 53,569             37,904   
Other receivables
                 451              1,157   
 
                  125,981             111,902   
Less allowance for doubtful accounts
                 (3,122 )            (2,841 )  
 
               $ 122,859          $ 109,061  
Allowance for doubtful accounts
Description and Fiscal Year
     Balance at
Beginning of Year
   Charged to Costs
And Expenses
   Deductions to
Bad Debt
   Balance at
End of Year
Allowance for doubtful accounts:
                                                                        
July 31, 2011
              $ 2,841          $ 478           $ (197 )         $ 3,122   
July 31, 2010
                 2,405             1,591             (1,155 )            2,841   
July 31, 2009
                 2,600             783              (978 )            2,405