Quarterly report pursuant to Section 13 or 15(d)

Net Income Per Common Share (Details)

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Net Income Per Common Share (Details) (USD $)
In Thousands, except Per Share data
3 Months Ended 6 Months Ended
Jul. 30, 2011
Jul. 31, 2010
Jul. 30, 2011
Jul. 31, 2010
Net income per common share reconciliation        
Net income $ 23,905 $ 13,062 $ 47,201 $ 26,723
Denominator for basic net income per share - weighted-average common shares 61,126 58,727 60,840 58,517
Dilutive effect of stock options and non-vested stock 2,115 1,945 2,173 1,988
Denominator for diluted net income per share 63,241 60,672 63,013 60,505
Net income per common share:        
Basic $ 0.39 $ 0.22 $ 0.78 $ 0.46
Diluted $ 0.38 $ 0.22 $ 0.75 $ 0.44
Net income per common share (Textuals) [Abstract]        
Antidilutive stock option excluded from computation of net income per common share 124 1,061 252 1,061