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Earnings Per Share (Tables)
 3 Months Ended
Apr. 30, 2011
Earnings Per Share  
Reconciliation of the Number of Shares (Denominator) Used in the Basic and Diluted EPS Computations
       
    Three Months Ended  
              Effect of              
          dilutive          
          common          
    Basic   stock     Diluted  
  Shares in (000s) EPS   equivalents     EPS  
  April 30, 2011                    
       Shares   114,764      2,009       116,773  
       Amount $ 1.51   $ (0.03 )   $ 1.48  
                       
  May 1, 2010                    
       Shares    119,829     2,503        122,332  
       Amount $ 1.19   $ (0.03 )   $ 1.16