Quarterly report pursuant to Section 13 or 15(d)

Divestiture Activities - Summary of Assets and Liabilities Held for Sale (Details)

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Divestiture Activities - Summary of Assets and Liabilities Held for Sale (Details) - USD ($)
$ in Thousands
Mar. 30, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Assets Held for Sale $ 0 $ 19,358
Held for Sale | Test Systems Segment    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Inventories   14,385
Prepaid Expenses and Other Current Assets   87
Net Property, Plant and Equipment   3,521
Other Assets   714
Intangible Assets, Net of Accumulated Amortization   651
Assets Held for Sale   19,358
Deferred Income Taxes   $ 906