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Share-based payments (Tables)
 12 Months Ended
Jan. 31, 2014
Share-based payments  
Schedule of weighted average key assumptions used in determining the fair value of all options
 
   January 31,
2014		   February 1,
2013		   February 3,
2012		  

Expected dividend yield

     0 %   0 %   0 %

Expected stock price volatility

     26.2 %   26.8 %   38.7 %

Weighted average risk-free interest rate

     1.2 %   1.5 %   2.3 %

Expected term of options (years)

     6.3     6.3     6.8  
Share-based payments  
Summary of performance share unit award activity
(Intrinsic value amounts reflected in thousands)
  Units
Issued		   Intrinsic
Value		  

Balance, February 1, 2013

     162,688        

Granted

     72,846        

Converted to common stock

     (54,973 )      

Canceled

     (21,142 )      
           
​ ​ ​ ​ ​ ​ ​ ​

Balance, January 31, 2014

     159,419   $ 8,978  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Summary of restricted stock unit award activity
(Intrinsic value amounts reflected in thousands)
  Units
Issued		   Intrinsic
Value		  

Balance, February 1, 2013

     288,927        

Granted

     509,440        

Converted to common stock

     (98,063 )      

Canceled

     (83,777 )      
           
​ ​ ​ ​ ​ ​ ​ ​

Balance, January 31, 2014

     616,527   $ 34,723  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of share-based compensation expense
(In thousands)
  Stock
Options		   Performance
Share Units		   Restricted
Stock Units		   Equity
Appreciation
Rights		   Total  

Year ended January 31, 2014

                                

Pre-tax

   $ 7,634   $ 3,448   $ 9,879   $ —   $ 20,961  

Net of tax

   $ 4,649   $ 2,100   $ 6,016   $ —   $ 12,765  

Year ended February 1, 2013

                                

Pre-tax

   $ 14,078   $ 4,082   $ 3,504   $ —   $ 21,664  

Net of tax

   $ 8,578   $ 2,487   $ 2,135   $ —   $ 13,200  

Year ended February 3, 2012

                                

Pre-tax

   $ 15,121   $ —   $ 129   $ 8,731   $ 23,981  

Net of tax

   $ 9,208   $ —   $ 79   $ 5,317   $ 14,604  
Time Options
  
Share-based payments  
Summary of options activity
(Intrinsic value amounts reflected in thousands)
  Options
Issued		   Average
Exercise Price		   Remaining
Contractual
Term in Years		   Intrinsic
Value		  

Balance, February 1, 2013

     1,350,642   $ 13.69              

Granted

     —     —              

Exercised

     (871,037 )   11.11              

Canceled

     (15,042 )   25.17              
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance, January 31, 2014

     464,563   $ 18.15     5.6   $ 17,730  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Exercisable at January 31, 2014

     292,807   $ 15.43     5.3   $ 11,973  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Performance Options
  
Share-based payments  
Summary of options activity
(Intrinsic value amounts reflected in thousands)
  Options
Issued		   Average
Exercise Price		   Remaining
Contractual
Term in Years		   Intrinsic
Value		  

Balance, February 1, 2013

     1,264,826   $ 13.96              

Granted

     —     —              

Exercised

     (868,441 )   11.28              

Canceled

     (20,076 )   22.69              
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance, January 31, 2014

     376,309   $ 19.68     5.8   $ 13,790  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Exercisable at January 31, 2014

     336,716   $ 18.56     5.7   $ 12,714  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Other Options
  
Share-based payments  
Summary of options activity
(Intrinsic value amounts reflected in thousands)
  Options
Issued		   Average
Exercise Price		   Remaining
Contractual
Term in Years		   Intrinsic
Value		  

Balance, February 1, 2013

     1,211,771   $ 42.77              

Granted

     875,269     48.80              

Exercised

     (53,813 )   41.51              

Canceled

     (192,685 )   46.69              
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance, January 31, 2014

     1,840,542   $ 45.26     8.5   $ 20,356  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Exercisable at January 31, 2014

     369,424   $ 38.51     7.4   $ 6,580  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​