Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 03, 2013	Jul. 28, 2012	Aug. 03, 2013	Jul. 28, 2012
Earnings Per Share [Abstract]
Net income	$ 84,163	$ 53,663	$ 148,984	$ 110,820
Weighted average common shares outstanding (for basic calculation) (in shares)	122,901,000	119,928,000	122,802,000	120,721,000
Dilutive effect of stock-based awards (in shares)	2,692,000	4,605,000	2,926,000	5,047,000
Weighted average common shares outstanding (for diluted calculation) (in shares)	125,593,000	124,533,000	125,728,000	125,768,000
Earnings per common share - basic (in dollars per share)	$ 0.68	$ 0.45	$ 1.21	$ 0.92
Earnings per common share - diluted (in dollars per share)	$ 0.67	$ 0.43	$ 1.18	$ 0.88
Anti-dilutive stock-based awards excluded from the calculation of diluted earnings per common share (in shares)	1,100,000	1,100,000	900,000	1,000,000