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Segment Information - Revenue by Product Line (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 29, 2017
Oct. 30, 2016
Oct. 29, 2017
Oct. 30, 2016
Revenue from External Customer [Line Items]        
Net sales $ 150,304,000 $ 137,185,000 $ 447,233,000 $ 404,241,000
Signal Integrity [Member]        
Revenue from External Customer [Line Items]        
Net sales 63,921,000 60,550,000 198,645,000 193,745,000
Protection [Member]        
Revenue from External Customer [Line Items]        
Net sales 49,366,000 40,250,000 136,673,000 108,296,000
Wireless and Sensing [Member]        
Revenue from External Customer [Line Items]        
Net sales 31,146,000 24,070,000 92,378,000 60,514,000
Power and High Reliability [Member]        
Revenue from External Customer [Line Items]        
Net sales 12,120,000 15,984,000 34,263,000 45,150,000
Systems Innovation [Member]        
Revenue from External Customer [Line Items]        
Net sales 0 0 0 205,000
Other: Warrant Shares [Member]        
Revenue from External Customer [Line Items]        
Net sales offset $ (6,249,000) $ (3,669,000) $ (14,726,000) $ (3,669,000)
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% 43.00% 48.00%
Net sales [Member] | Protection [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 33.00% 29.00% 31.00% 27.00%
Net sales [Member] | Wireless and Sensing [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 21.00% 18.00% 21.00% 15.00%
Net sales [Member] | Power and High Reliability [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 8.00% 12.00% 8.00% 11.00%
Net sales [Member] | Systems Innovation [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 0.00% 0.00% 0.00% 0.00%
Net sales [Member] | Other: Warrant Shares [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage (4.00%) (3.00%) (3.00%) (1.00%)