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. 26, 2014	Oct. 27, 2013	Oct. 26, 2014	Oct. 27, 2013
Earnings Per Share [Abstract]
Net income	$ 17,623	$ 12,453	$ 43,388	$ 46,342
Weighted average common shares outstanding - basic	67,162	67,792	67,223	67,454
Dilutive effect of options and restricted stock units	492	1,079	568	1,365
Weighted average common shares outstanding - diluted	67,654	68,871	67,791	68,819
Basic earnings per common share	$ 0.26	$ 0.18	$ 0.65	$ 0.69
Diluted earnings per common share	$ 0.26	$ 0.18	$ 0.64	$ 0.67
Anti-dilutive shares not included in the above calculations	1,951	598	1,710	456