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Stock-Based Compensation (Details) (USD $)
3 Months Ended 9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Stock-based compensation expense by type [Abstract]        
Stock options $ 32,000 $ 19,000 $ 774,000 $ 442,000
Restricted stock unit awards 1,024,000 1,594,000 3,978,000 4,214,000
Employee stock purchase 16,000 19,000 51,000 60,000
Director deferred compensation 15,000 15,000 21,000 45,000
Total stock-based compensation expense 1,087,000 1,647,000 4,824,000 4,761,000
Income tax benefit recognized 403,000 604,000 1,797,000 1,747,000
Stock-based compensation expense, net of income tax 684,000 1,043,000 3,027,000 3,014,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock purchased during the period under the employee stock purchase plan (in shares) 1,769 2,472 6,183 7,550
Weighted-average grant date fair value of stock options granted (in dollars per share) $ 20.72 $ 13.86 $ 19.45 $ 12.81
Grant date fair value of shares purchased through the employee stock purchase plan (in dollars per share) $ 9.25 $ 8.95 $ 8.20 $ 8.23
Purchase price paid for stock purchased through the employee stock purchase plan (in dollars per share) $ 49.05 $ 28.81 $ 43.15 $ 29.97
Total compensation costs related to nonvested restricted stock unit awards not yet recognized $ 9,700,000   $ 9,700,000  
Weighted-average period over which nonvested restricted stock unit awards are expected to be recognized (in years)     2.50  
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted 1,530 1,341 39,772 34,551
Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Awarded 2,801 1,000 66,317 103,143
Performance-based Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Awarded 0 0 38,100 53,000
Deferred Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Awarded 252 442 361 1,229