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) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 12, 2019
Jul. 01, 2019
Feb. 13, 2019
Sep. 28, 2019
Mar. 30, 2019
Sep. 28, 2019
Sep. 29, 2018
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Acquisition of business, net of cash acquired           $ 21,785,000 $ 0  
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            
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   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 | Aerospace Segment                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Net Property, Plant and Equipment       $ 3,186,000   $ 3,186,000    
Held for Sale | Test Systems Segment                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Net Property, Plant and Equipment               $ 3,521,000
Impairment loss               $ 0
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         $ 21,300,000