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Accounts Receivable, Net (Tables)
 12 Months Ended
Jul. 31, 2013
Accounts Receivable, Net [Abstract]  
Schedule of accounts receivable
 

 
     Years Ended July 31,    
     2013    2012
Advance charges receivable
               $ 118,584          $ 85,237   
Trade accounts receivable
                  65,660             53,163   
Other receivables
                  1,153             2,420   
 
                  185,397             140,820   
Less allowance for doubtful accounts
                  (2,683 )            (2,920 )  
 
               $ 182,714          $ 137,900   
 
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, 2013
               $ 2,920          $ 1,424          $ (1,661 )         $ 2,683   
July 31, 2012
                  3,122             1,626             (1,828 )            2,920   
July 31, 2011
                  2,841             478              (197 )            3,122