Significant Accounting Policies - Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	May 01, 2016	Jan. 31, 2016	Oct. 25, 2015	Jul. 26, 2015	Apr. 26, 2015	Jan. 29, 2017	Jan. 31, 2016	Jan. 25, 2015
Earnings Per Share, Basic and Diluted [Abstract]
Net income (loss)	$ 8,020	$ 30,776	$ 8,978	$ 6,887	$ 1,247	$ 10,704	$ (313)	$ (142)	$ 54,661	$ 11,497	$ 27,947
Weighted average common shares outstanding - basic	65,716	65,549	65,299	65,144	64,934	65,117	65,920	66,713	65,427	65,657	67,108
Dilutive effect of share-based compensation									682	304	577
Weighted average common shares outstanding - diluted	66,757	66,206	65,905	65,552	65,225	65,217	65,920	66,713	66,109	65,961	67,685
Basic earnings (loss) per common share (in dollars per share)	$ 0.12	$ 0.47	$ 0.14	$ 0.11	$ 0.02	$ 0.16	$ 0.00	$ 0.00	$ 0.84	$ 0.18	$ 0.42
Diluted earnings (loss) per common share (in dollars per share)	$ 0.12	$ 0.46	$ 0.14	$ 0.11	$ 0.02	$ 0.16	$ 0.00	$ 0.00	$ 0.83	$ 0.17	$ 0.41
Anti-dilutive shares not included in the above calculations									1,111	2,569	1,714