Quarterly report pursuant to Section 13 or 15(d)

Net income per common share - Net Income Per Basic and Diluted Share (Detail)

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Net income per common share - Net Income Per Basic and Diluted Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Earnings Per Share [Line Items]        
Net income $ 38,151 $ 26,768 $ 108,017 $ 73,969
Denominator for basic net income per share - weighted-average common shares 63,484 61,451 63,016 61,044
Dilutive effect of stock options and non-vested stock 999 1,968 1,269 2,129
Denominator for diluted net income per share 64,483 63,419 64,285 63,173
Net income per common share:        
Basic $ 0.60 $ 0.44 $ 1.71 $ 1.21
Diluted $ 0.59 $ 0.42 $ 1.68 $ 1.17