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Segment Information - Revenue by Product Line (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 29, 2018
Jul. 30, 2017
Jul. 29, 2018
Jul. 30, 2017
Revenue from External Customer [Line Items]        
Net sales $ 163,211,000 $ 153,127,000 $ 293,640,000 $ 296,929,000
Signal Integrity [Member]        
Revenue from External Customer [Line Items]        
Net sales 68,802,000 66,666,000 134,401,000 134,724,000
Protection [Member]        
Revenue from External Customer [Line Items]        
Net sales 45,999,000 45,058,000 86,791,000 87,307,000
Wireless and Sensing [Member]        
Revenue from External Customer [Line Items]        
Net sales 48,410,000 44,600,000 93,949,000 83,375,000
Other: Warrant Shares        
Revenue from External Customer [Line Items]        
Net sales offset $ 0 $ (3,197,000) $ (21,501,000) $ (8,477,000)
Net sales [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 100.00% 100.00% 100.00% 100.00%
Net sales [Member] | Signal Integrity [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 42.00% 44.00% 45.00% 46.00%
Net sales [Member] | Protection [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 28.00% 29.00% 30.00% 29.00%
Net sales [Member] | Wireless and Sensing [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 30.00% 29.00% 32.00% 28.00%
Net sales [Member] | Other: Warrant Shares        
Revenue from External Customer [Line Items]        
Concentration risk, percentage (0.00%) (2.00%) (7.00%) (3.00%)