Segment Information - Revenue by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 26, 2020	Apr. 28, 2019
Revenue from External Customer [Line Items]
Net sales	$ 132,702	$ 131,354
Signal Integrity
Revenue from External Customer [Line Items]
Net sales	59,929	50,257
Wireless and Sensing
Revenue from External Customer [Line Items]
Net sales	32,958	42,207
Protection
Revenue from External Customer [Line Items]
Net sales	$ 39,815	$ 38,890
Net sales
Revenue from External Customer [Line Items]
Concentration risk, percentage	100.00%	100.00%
Net sales | Signal Integrity
Revenue from External Customer [Line Items]
Concentration risk, percentage	45.00%	38.00%
Net sales | Wireless and Sensing
Revenue from External Customer [Line Items]
Concentration risk, percentage	25.00%	32.00%
Net sales | Protection
Revenue from External Customer [Line Items]
Concentration risk, percentage	30.00%	30.00%