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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%

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Date the credit facility terminates, in CCYY-MM-DD format.

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Date the credit facility first became available, in CCYY-MM-DD format.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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