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Segment Information - Revenue by Product Line (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 28, 2019	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018
Revenue from External Customer [Line Items]
Net sales	$ 137,146,000	$ 163,211,000	$ 268,500,000	$ 293,640,000
Signal Integrity
Revenue from External Customer [Line Items]
Net sales	55,094,000	68,802,000	105,350,000	134,401,000
Wireless and Sensing
Revenue from External Customer [Line Items]
Net sales	41,696,000	48,410,000	83,903,000	93,949,000
Protection
Revenue from External Customer [Line Items]
Net sales	40,356,000	45,999,000	79,247,000	86,791,000
Other: Warrant Shares
Revenue from External Customer [Line Items]
Net sales offset	$ 0	$ 0	$ 0	$ (21,501,000)
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	40.00%	42.00%	39.00%	45.00%
Net sales | Wireless and Sensing
Revenue from External Customer [Line Items]
Concentration risk, percentage	30.00%	30.00%	31.00%	32.00%
Net sales | Protection
Revenue from External Customer [Line Items]
Concentration risk, percentage	30.00%	28.00%	30.00%	30.00%
Net sales | Other: Warrant Shares
Revenue from External Customer [Line Items]
Concentration risk, percentage	0.00%	0.00%	0.00%	(7.00%)

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