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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2017
Mar. 26, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Effective tax rate 39.80% 27.10%
Tax benefit associated with stock compensation $ 7,500  
Increase in unrecognized tax benefits 900  
Unrecognized tax benefits 25,100  
Increase in unrecognized tax benefits that would impact effective tax rate 800  
Unrecognized tax benefits that would impact effective tax rate 22,200  
Accrued interest and penalties on unrecognized tax benefits 1,900 $ 200
Decrease in unrecognized tax benefits that are reasonably possibly over the next twelve-month period 5,000  
Income tax expense 226 142
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 226 $ 100
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