(Loss) Earnings Per Share - Computation Of Basic And Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 26, 2015	Jul. 27, 2014	Jul. 26, 2015	Jul. 27, 2014
Earnings Per Share [Abstract]
Net (loss) income	$ (313)	$ 17,898	$ (455)	$ 25,765
Weighted average common shares outstanding - basic	65,920	67,208	66,319	67,254
Dilutive effect of options and restricted stock units	0	642	0	634
Weighted average common shares outstanding - diluted	65,920	67,850	66,319	67,888
Basic (loss) earnings (in dollars per share)	$ 0.00	$ 0.27	$ (0.01)	$ 0.38
Diluted (loss) earnings per common share	$ 0.00	$ 0.26	$ (0.01)	$ 0.38
Anti-dilutive shares not included in the above calculations	2,894	1,463	2,418	1,427