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Earnings per share
 12 Months Ended
Jan. 31, 2014
Earnings per share  
Earnings per share

3. Earnings per share

        Earnings per share is computed as follows (in thousands except per share data):

 
   2013  
 
   Net Income   Weighted
Average
Shares		   Per Share
Amount		  

Basic earnings per share

   $ 1,025,116     322,886   $ 3.17  

Effect of dilutive share-based awards

           968        
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Diluted earnings per share

   $ 1,025,116     323,854   $ 3.17  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               


 

 
   2012  
 
   Net Income   Weighted
Average
Shares		   Per Share
Amount		  

Basic earnings per share

   $ 952,662     332,254   $ 2.87  

Effect of dilutive share-based awards

           2,215        
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Diluted earnings per share

   $ 952,662     334,469   $ 2.85  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               


 

 
   2011  
 
   Net Income   Weighted
Average
Shares		   Per Share
Amount		  

Basic earnings per share

   $ 766,685     341,234   $ 2.25  

Effect of dilutive share-based awards

           3,883        
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Diluted earnings per share

   $ 766,685     345,117   $ 2.22  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

        Basic earnings per share was computed by dividing net income by the weighted average number of shares of common stock outstanding during the year. Diluted earnings per share was determined based on the dilutive effect of share-based awards using the treasury stock method.

        Options to purchase shares of common stock that were outstanding at the end of the respective periods, but were not included in the computation of diluted earnings per share because the effect of exercising such options would be antidilutive, were 1.1 million, 0.8 million, and zero in 2013, 2012 and 2011, respectively.