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Segment Information - Revenue by Product Line (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 30, 2016
Oct. 25, 2015
Oct. 30, 2016
Oct. 25, 2015
Revenue from External Customer [Line Items]        
Net sales $ 137,185,000 $ 115,810,000 $ 404,241,000 $ 371,610,000
Signal Integrity [Member]        
Revenue from External Customer [Line Items]        
Net sales 60,550,000 52,449,000 193,745,000 165,780,000
Protection [Member]        
Revenue from External Customer [Line Items]        
Net sales 40,250,000 33,225,000 108,296,000 105,339,000
Wireless and Sensing [Member]        
Revenue from External Customer [Line Items]        
Net sales 24,070,000 16,567,000 60,514,000 54,898,000
Power and High Reliability [Member]        
Revenue from External Customer [Line Items]        
Net sales 15,984,000 13,554,000 45,150,000 43,673,000
Systems Innovation [Member]        
Revenue from External Customer [Line Items]        
Net sales 0 15,000 205,000 1,920,000
Other: Warrant Shares [Member]        
Revenue from External Customer [Line Items]        
Net sales offset $ (3,669,000) $ 0 $ (3,669,000) $ 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% 45.00% 48.00% 44.00%
Net sales [Member] | Protection [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 29.00% 29.00% 27.00% 28.00%
Net sales [Member] | Wireless and Sensing [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 18.00% 14.00% 15.00% 15.00%
Net sales [Member] | Power and High Reliability [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 12.00% 12.00% 11.00% 12.00%
Net sales [Member] | Systems Innovation [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage 0.00% 0.00% 0.00% 1.00%
Net sales [Member] | Other: Warrant Shares [Member]        
Revenue from External Customer [Line Items]        
Concentration risk, percentage (3.00%) 0.00% (1.00%) 0.00%