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Segment Information - Revenue by Product Line (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 30, 2017
Jul. 31, 2016
Jul. 30, 2017
Jul. 31, 2016
Revenue from External Customer [Line Items]        
Net sales $ 153,127,000 $ 135,911,000 $ 296,929,000 $ 267,056,000
Signal Integrity [Member]        
Revenue from External Customer [Line Items]        
Net sales 66,666,000 63,313,000 134,724,000 133,195,000
Protection [Member]        
Revenue from External Customer [Line Items]        
Net sales 45,058,000 36,476,000 87,307,000 68,046,000
Wireless and Sensing [Member]        
Revenue from External Customer [Line Items]        
Net sales 33,221,000 20,837,000 61,231,000 36,444,000
Power and High Reliability [Member]        
Revenue from External Customer [Line Items]        
Net sales 11,379,000 15,285,000 22,144,000 29,166,000
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 $ (3,197,000) $ 0 $ (8,477,000) $ 0
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 44.00% 47.00% 46.00% 50.00%
Net sales [Member] | Protection [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 29.00% 27.00% 29.00% 25.00%
Net sales [Member] | Wireless and Sensing [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 22.00% 15.00% 21.00% 14.00%
Net sales [Member] | Power and High Reliability [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 7.00% 11.00% 7.00% 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 (2.00%) 0.00% (3.00%) 0.00%