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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Jun. 25, 2016
Jul. 01, 2017
Jun. 25, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Effective tax rate 28.90% 34.60% 34.40% 31.00%
Tax benefit associated with stock compensation $ 1,300   $ 8,800  
Increase in unrecognized tax benefits 900      
Unrecognized tax benefits 26,000   26,000  
Increase in unrecognized tax benefits that would impact effective tax rate     700  
Unrecognized tax benefits that would impact effective tax rate 22,900   22,900  
Accrued interest and penalties on unrecognized tax benefits 2,400   2,400  
Decrease in unrecognized tax benefits that are reasonably possibly over the next twelve-month period 5,000   5,000  
Income tax expense 397 $ 142 623 $ 284
Pension and Other Post-Retirement Benefit Plans        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income tax expense $ 400 $ 100 623 $ 300
CDMO Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Tax on gain on divestiture     $ 18,000