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Share-Based Compensation (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended
May 31, 2008
Jan. 28, 2012
Jan. 29, 2011
Jan. 30, 2010
Nonvested stock awards/units
       
Number of Shares/Units        
Nonvested at the beginning of the period (in shares)   1,032,854    
Granted (in shares) 167,000 347,535    
Vested (in shares)   (534,762)    
Forfeited (in shares)   (112,360)    
Nonvested at the end of the period (in shares)   733,267 1,032,854  
Weighted Average Grant-Date Fair Value        
Nonvested at the beginning of the period (in dollars per share)   $ 35.95    
Granted (in dollars per share)   $ 38.98 $ 45.51 $ 20.03
Vested (in dollars per share)   $ 36.28    
Forfeited (in dollars per share)   $ 42.13    
Nonvested at the end of the period (in dollars per share)   $ 36.20 $ 35.95  
Additional disclosures, awards other than options        
Total fair value at grant date of previously nonvested stock awards/units that were vested during the period   $ 19.4 $ 20.5 $ 16.0
Total intrinsic value of nonvested stock awards/units that vested during the period   19.3 26.7 14.3
Total intrinsic value of nonvested stock awards/units outstanding and unvested   $ 21.5    
Employee Stock Purchase Plan
       
Weighted Average Grant-Date Fair Value        
Granted (in dollars per share)   $ 9.35 $ 9.39 $ 5.19
Additional disclosures, awards other than options        
Minimum holding period for shares purchased after April 1, 2009 under the ESPP (in months)   6    
Period before the end of each fiscal quarter prohibited for trading, as per company's securities trading policy (in weeks)   2    
Period after public announcement of earnings prohibited for trading, as per company's securities trading policy (in days)   2    
Extended expiration period (in years)   10    
Common stock issued during the period (in shares)   47,456 42,695 73,810
Average price per share (in dollars per share)   $ 29.00 $ 30.69 $ 16.92