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Assets and Liabilities Held For Sale (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 29, 2020
Dec. 28, 2019
Jun. 29, 2019
Lithium Niobate | Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Sale of product lines   $ 17.0  
Proceeds from sale of product lines   2.5  
Lithium Niobate | Disposed of by Sale | Forecast      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of product lines $ 12.8    
Remaining holdback $ 1.7    
Datacom | Held-for-sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property, plant and equipment, net   $ 7.0 $ 4.9