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Shareholders' Equity (Tables)
6 Months Ended
Jul. 31, 2011
Shareholders' Equity  
Company's Common Share Repurchase And Issuance Activity
     Shares     Weighted-
average
price per
share
 

Treasury stock held at January 31, 2011

     12,517,538      $ 37.28   

Shares of common stock repurchased under share repurchase program

     4,229,179        47.29   

Shares of treasury stock reissued

     (904,353     38.13   
  

 

 

   

Treasury stock held at July 31, 2011

     15,842,364        39.90