Significant Accounting Policies - Schedule of New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($) $ / shares in Units, $ 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
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 160,006	$ 173,550	$ 163,211	$ 130,429	$ 140,614	$ 150,304	$ 153,127	$ 143,802	$ 627,196	$ 587,847	$ 544,272
Cost of sales									250,174	235,876	219,410
Provision for income taxes									(84)	23,191	18,399
Net income	$ 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 (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
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales									$ 9,848
Cost of sales									2,247
Provision for income taxes									1,596
Net income									$ 6,005
Earnings per share:
Basic (in dollars per share)									$ 0.09
Diluted (in dollars per share)									$ 0.09
Deferred revenue	$ (19,987)								$ (19,987)