Selected Quarterly Financial Data (Unaudited) - (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 30, 2017	Apr. 30, 2017	Jan. 27, 2019	Jan. 28, 2018	Jan. 29, 2017
Selected Quarterly Financial Information [Abstract]
Net sales	$ 160,006	$ 173,550	$ 163,211	$ 130,429	$ 140,614	$ 150,304	$ 153,127	$ 143,802	$ 627,196	$ 587,847	$ 544,272
Selected Quarterly Financial Data (in Dollars) [Abstract]
Gross profit	98,867	106,562	100,124	71,469	85,401	89,419	92,236	84,915	377,022	351,971	324,862
Operating income	26,771	41,867	32,936	(3,097)	14,009	17,579	18,892	18,256	98,477	68,736	84,081
Net income (loss)	$ 13,340	$ 12,165	$ 25,169	$ 12,382	$ (1,297)	$ 13,338	$ 12,564	$ 11,821	$ 63,056	$ 36,426	$ 54,661
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 0.20	$ 0.18	$ 0.38	$ 0.19	$ (0.02)	$ 0.20	$ 0.19	$ 0.18	$ 0.96	$ 0.55	$ 0.84
Diluted (in dollars per share)	$ 0.20	$ 0.18	$ 0.37	$ 0.18	$ (0.02)	$ 0.20	$ 0.19	$ 0.18	$ 0.92	$ 0.54	$ 0.83
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	65,525	66,014	66,063	66,324	66,310	66,194	65,763	65,839	65,982	66,027	65,427
Diluted (in shares)	68,165	68,731	68,880	68,195	66,310	67,817	67,470	67,376	68,481	67,605	66,109