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GOODWILL AND INTANGIBLE ASSETS - Rollforward of Company's Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Gross carrying amount, beginning balance	$ 1,809,906	$ 1,792,517
Adjustments to goodwill, acquisitions/divestitures	462,774	(24,058)
Adjustments to goodwill, foreign exchange	(20,547)	41,447
Gross carrying amount, ending balance	2,252,133	1,809,906
Accumulated impairment loss - DSA	(1,005,000)	(1,005,000)	$ (1,005,000)
Goodwill	1,247,133	804,906	$ 787,517
RMS
Goodwill [Roll Forward]
Gross carrying amount, beginning balance	58,122	56,397
Adjustments to goodwill, acquisitions/divestitures	0	0
Adjustments to goodwill, foreign exchange	(1,154)	1,725
Gross carrying amount, ending balance	56,968	58,122
DSA
Goodwill [Roll Forward]
Gross carrying amount, beginning balance	1,610,176	1,568,476
Adjustments to goodwill, acquisitions/divestitures	460,223	11,942
Adjustments to goodwill, foreign exchange	(13,929)	29,758
Gross carrying amount, ending balance	2,056,470	1,610,176
Manufacturing
Goodwill [Roll Forward]
Gross carrying amount, beginning balance	141,608	167,644
Adjustments to goodwill, acquisitions/divestitures	2,551	(36,000)
Adjustments to goodwill, foreign exchange	(5,464)	9,964
Gross carrying amount, ending balance	$ 138,695	$ 141,608

X

- Definition

Amount after 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.

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