Segment Information - Revenue by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 26, 2020	Jul. 28, 2019	Jul. 26, 2020	Jul. 28, 2019
Revenue from External Customer [Line Items]
Net sales	$ 143,660	$ 137,146	$ 276,362	$ 268,500
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Signal Integrity
Revenue from External Customer [Line Items]
Net sales	$ 71,645	$ 55,094	$ 131,574	$ 105,350
Wireless and Sensing
Revenue from External Customer [Line Items]
Net sales	38,830	41,696	71,788	83,903
Protection
Revenue from External Customer [Line Items]
Net sales	$ 33,185	$ 40,356	$ 73,000	$ 79,247
Net sales
Revenue from External Customer [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Net sales | Signal Integrity
Revenue from External Customer [Line Items]
Concentration risk, percentage	50.00%	40.00%	48.00%	39.00%
Net sales | Wireless and Sensing
Revenue from External Customer [Line Items]
Concentration risk, percentage	27.00%	30.00%	26.00%	31.00%
Net sales | Protection
Revenue from External Customer [Line Items]
Concentration risk, percentage	23.00%	30.00%	26.00%	30.00%