Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 28, 2012	Oct. 30, 2011	Oct. 28, 2012	Oct. 30, 2011
Earnings Per Share [Abstract]
Net income	$ 16,590	$ 26,979	$ 28,821	$ 76,699
Weighted average common shares outstanding - basic	65,996	65,440	65,622	65,180
Dilutive effect of employee equity incentive plans	1,469	1,874	1,684	2,359
Weighted average common shares outstanding - diluted	67,465	67,314	67,306	67,539
Basic earnings per common share	$ 0.25	$ 0.41	$ 0.44	$ 1.18
Diluted earnings per common share	$ 0.25	$ 0.40	$ 0.43	$ 1.14
Anti-dilutive shares not included in the above calculations	1,053	708	1,163	662