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Comprehensive Income
9 Months Ended
Apr. 30, 2011
Comprehensive Income [Abstract]  
Comprehensive Income
5.   Comprehensive Income
                                 
    Three Months Ended     Nine Months Ended  
    April 30,     April 30,  
    2011     2010     2011     2010  
Net Income
  $ 40,008     $ 34,111     $ 69,384     $ 69,464  
Foreign currency translation adjustment, net of tax
          (1,803 )           (1,762 )
Change in temporary impairment of investments, net of tax
    3       17       158       (15 )
 
                       
Comprehensive income
  $ 40,011     $ 32,325     $ 69,542     $ 67,687