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BUSINESS ACQUISITIONS - Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Citoxlab
Business Acquisition [Line Items]
Revenue	$ 673,645	$ 630,411	$ 1,325,483	$ 1,168,651
Net income attributable to common shareholders	$ 53,625	54,990	$ 114,653	107,859
MPI Research
Business Acquisition [Line Items]
Revenue		585,297		1,141,388
Net income attributable to common shareholders		$ 60,161		$ 109,575

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
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