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. 28, 2018	Oct. 29, 2017	Jul. 30, 2017	Apr. 30, 2017	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	May 01, 2016	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016
Earnings Per Share, Basic and Diluted [Abstract]
Net income (loss)	$ (1,297)	$ 13,338	$ 12,564	$ 11,821	$ 8,020	$ 30,776	$ 8,978	$ 6,887	$ 36,426	$ 54,661	$ 11,497
Weighted average common shares outstanding - basic	66,310	66,194	65,763	65,839	65,716	65,549	65,299	65,144	66,027	65,427	65,657
Dilutive effect of share-based compensation									1,578	682	304
Weighted average common shares outstanding - diluted	66,310	67,817	67,470	67,376	66,757	66,206	65,905	65,552	67,605	66,109	65,961
Basic earnings (loss) per common share (in dollars per share)	$ (0.02)	$ 0.20	$ 0.19	$ 0.18	$ 0.12	$ 0.47	$ 0.14	$ 0.11	$ 0.55	$ 0.84	$ 0.18
Diluted earnings (loss) per common share (in dollars per share)	$ (0.02)	$ 0.20	$ 0.19	$ 0.18	$ 0.12	$ 0.46	$ 0.14	$ 0.11	$ 0.54	$ 0.83	$ 0.17
Anti-dilutive shares not included in the above calculations									402	1,111	2,569