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Goodwill and Intangible Assets - Rollforward of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Changes in gross carrying amount and accumulated amortization of goodwill
December 30, 2017	$ 804,906
Acquisitions	18,165
Foreign Exchange	12,865
March 31, 2018	835,936
RMS
Changes in gross carrying amount and accumulated amortization of goodwill
December 30, 2017	58,122
Acquisitions	0
Foreign Exchange	706
March 31, 2018	58,828
DSA
Changes in gross carrying amount and accumulated amortization of goodwill
December 30, 2017	605,176
Acquisitions	18,165
Foreign Exchange	8,854
March 31, 2018	632,195
Manufacturing
Changes in gross carrying amount and accumulated amortization of goodwill
December 30, 2017	141,608
Acquisitions	0
Foreign Exchange	3,305
March 31, 2018	$ 144,913

X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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X

- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a,h)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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