Quarterly report pursuant to Section 13 or 15(d)

Divestiture Activities - Narrative (Details)

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Divestiture Activities - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 13, 2019
Mar. 30, 2019
Jun. 29, 2019
Dec. 31, 2018
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]        
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