Significant Accounting Policies (Computation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 29, 2012	Oct. 30, 2011	Jul. 31, 2011	May 01, 2011	Jan. 30, 2011	Oct. 31, 2010	Aug. 01, 2010	May 02, 2010	Jan. 29, 2012	Jan. 30, 2011	Jan. 31, 2010
Significant Accounting Policies [Abstract]
Net income	$ 12,388	$ 26,979	$ 27,138	$ 22,582	$ 26,003	$ 16,105	$ 19,662	$ 10,802	$ 89,087	$ 72,572	$ 957
Weighted average common shares outstanding - basic	64,856	65,440	65,547	64,552	63,506	62,493	61,933	61,420	65,099	62,339	60,779
Dilutive effect of employee equity incentive plans									2,251	2,184	897
Weighted average common shares outstanding - diluted	66,776	67,314	68,186	67,123	66,213	64,555	63,552	63,181	67,350	64,523	61,676
Basic earnings per common share	$ 0.19	$ 0.41	$ 0.41	$ 0.35	$ 0.41	$ 0.26	$ 0.32	$ 0.18	$ 1.37	$ 1.16	$ 0.02
Diluted earnings per common share	$ 0.19	$ 0.40	$ 0.40	$ 0.34	$ 0.39	$ 0.25	$ 0.31	$ 0.17	$ 1.32	$ 1.12	$ 0.02
Anti-dilutive shares not included in the above calculations									625	1,700	8,900