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Accounts Receivable, Net (Tables)
 12 Months Ended
Jul. 31, 2012
Accounts Receivable, Net [Abstract]  
Schedule of accounts receivable
     July 31,   
     2012   2011
Advance charges receivable
              $ 85,237          $ 71,961   
Trade accounts receivable
                 54,229             53,569   
Other receivables
                 2,420             451    
 
                  141,886             125,981   
Less allowance for doubtful accounts
                 (2,920 )            (3,122 )  
 
               $ 138,966          $ 122,859   
Schedule of movements in the 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
July 31, 2012
              $ 3,122          $ 1,626          $ (1,828 )         $ 2,920   
July 31, 2011
                 2,841             478              (197 )            3,122   
July 31, 2010
                 2,405             1,591             (1,155 )            2,841