Earnings Per Share (Details) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Oct. 29, 2011	Oct. 30, 2010	Oct. 29, 2011	Oct. 30, 2010
Earnings Per Share [Abstract]
Net income	$ 26,467	$ 28,844	$ 115,776	$ 94,700
Net income allocated to participating securities	(362)	(288)	(1,462)	(731)
Net income available to common shareholders	$ 26,105	$ 28,556	$ 114,314	$ 93,969
Weighted average common shares outstanding-basic	166,518,711	176,215,239	170,912,046	177,027,767
Dilutive effect of stock options outstanding	1,056,062	1,046,809	1,179,739	1,292,095
Weighted average common and common equivalent shares outstanding-diluted	167,574,773	177,262,048	172,091,785	178,319,862
Net income per common share-basic	$ 0.16	$ 0.16	$ 0.67	$ 0.53
Net income per common share-diluted	$ 0.16	$ 0.16	$ 0.66	$ 0.53
Anti-dilutive securities excluded from computation of diluted EPS	3,830,402	3,785,990	3,751,480	3,349,846