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Earnings per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011
Earnings per Common Share
Net income	$ 53,663	$ 73,848	$ 110,820	$ 111,346
Weighted average common shares outstanding (for basic calculation)	119,928	120,207	120,721	119,784
Dilutive effect of stock-based awards (in shares)	4,605	5,629	5,047	5,818
Weighted average common shares outstanding (for diluted calculation)	124,533	125,836	125,768	125,602
Earnings per common share - basic	$ 0.45	$ 0.61	$ 0.92	$ 0.93
Earnings per common share - diluted	$ 0.43	$ 0.59	$ 0.88	$ 0.89

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