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Net Income Per Common Share (Tables)
 6 Months Ended
Jul. 31, 2011
Net Income Per Common Share  
Reconciliation Of Weighted Average Shares Outstanding Used For Computation Of Basic And Diluted Net Income Per Common Share
    Three Months Ended July 31,     Six Months Ended July 31,  
    2011     2010     2011     2010  

Basic weighted average shares outstanding

     158,581,618        168,908,598        160,436,550        168,880,803   

Effect of dilutive options, restricted stock and performance shares

     2,162,125        3,417,398        2,524,195        3,692,182   
 

 

 

    

 

 

    

 

 

    

 

 

  

Diluted weighted average shares outstanding

     160,743,743        172,325,996        162,960,745        172,572,985