Selected Quarterly Financial Data (Unaudited) - (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
Selected Quarterly Financial Data (in Dollars) [Abstract]
Net sales	$ 140,614	$ 150,304	$ 153,127	$ 143,802	$ 140,031	$ 137,185	$ 135,911	$ 131,145	$ 587,847	$ 544,272	$ 490,219
Gross profit	85,401	89,419	92,236	84,915	83,498	81,065	81,775	78,524	351,971	324,862	293,110
Operating income	14,009	17,579	18,892	18,256	15,288	39,099	16,427	13,267	68,736	84,081	29,999
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
Earnings Per Share, Basic and Diluted [Abstract]
Basic (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 (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
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	66,310	66,194	65,763	65,839	65,716	65,549	65,299	65,144	66,027	65,427	65,657
Diluted (in shares)	66,310	67,817	67,470	67,376	66,757	66,206	65,905	65,552	67,605	66,109	65,961