Quarterly report pursuant to Section 13 or 15(d)

Acquisition and Divestiture Activities - Narrative (Details)

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Acquisition and Divestiture Activities - Narrative (Details)
3 Months Ended 12 Months Ended
Oct. 04, 2019
USD ($)
Jul. 12, 2019
USD ($)
Jul. 01, 2019
USD ($)
Feb. 13, 2019
USD ($)
Mar. 28, 2020
USD ($)
element
Sep. 28, 2019
USD ($)
Mar. 30, 2019
USD ($)
Dec. 31, 2018
Dec. 31, 2019
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Number of elements for contingent earnouts | element         2        
Freedom Communication Technologies, Inc.                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Acquisition of business, net of cash acquired     $ 21,800,000            
Cash acquired     $ 600,000            
Diagnosys                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Cash paid to acquire stock $ 7,000,000.0                
Fair value of contingent purchase consideration 2,500,000                
Potential additional earn-out $ 13,000,000.0                
Achievement period 3 years                
Earn-out achievement benchmark $ 72,000,000.0                
Disposed by Sale | Airfield Lighting Product Line Assets                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Proceeds from sale   $ 1,000,000.0              
Percentage of revenue (as a percentage)               1.00%  
Loss on sale           $ 1,300,000      
Held for Sale | First Earnout                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Maximum total earnout proceeds         $ 35,000,000.0        
Held for Sale | Second Earnout                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Maximum total earnout proceeds         $ 0        
Held for Sale | Test Systems Segment                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Property, plant and equipment classified as held for sale                 $ 1,500,000
Divestiture by Sale | Test Systems Segment                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Total cash proceeds of divesture       $ 103,800,000          
Gain on sale, net of tax             $ 80,100,000    
Income taxes from divesture             $ 19,700,000