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Debt - Committed Loan Associated with Animal Health Spin-off (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 29, 2018
Apr. 20, 2018
Dec. 30, 2017
Debt Instrument [Line Items]      
Bank credit lines $ 1,144,881   $ 741,653
Line of Credit Facility, Interest Rate at Period End 3.06%   2.27%
Committed Loan Associated with Animal Health Spin-off [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Initiation Date May 21, 2018    
Line of Credit Facility, Maximum Borrowing Capacity $ 400,000    
Line of Credit Facility, Expiration Date Mar. 31, 2019    
Bank credit lines $ 400,000    
Equity Method Investment Aggregate Cost   $ 365,000  
Line of Credit Facility, Interest Rate at Period End 3.125%