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Comprehensive Income (Tables)
3 Months Ended
Oct. 31, 2011
Comprehensive Income [Abstract] 
Schedule Of Comprehensive Income
      Three Months Ended 
October 31, 2011
       Three Months Ended
October 31, 2010
 

Net income

       $ 22,358             $ 23,688   

Change in temporary impairment of investments, net of tax

     (31)           132   
  

 

 

      

 

 

 

Comprehensive income

       $ 22,327             $ 23,820