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GOODWILL AND INTANGIBLE ASSETS - Rollforward of Company's Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Goodwill [Roll Forward]
Gross carrying amount, beginning balance	$ 2,545,565	$ 2,252,133
Adjustments to goodwill, acquisitions	229,025	293,380
Adjustments to goodwill, foreign exchange	39,578	52
Gross carrying amount, ending balance	2,814,168	2,545,565
Accumulated impairment loss - DSA	(1,005,000)	(1,005,000)	$ (1,005,000)
Goodwill	1,809,168	1,540,565	$ 1,247,133
RMS
Goodwill [Roll Forward]
Gross carrying amount, beginning balance	56,586	56,968
Adjustments to goodwill, acquisitions	229,654	0
Adjustments to goodwill, foreign exchange	1,519	(382)
Gross carrying amount, ending balance	287,759	56,586
DSA
Goodwill [Roll Forward]
Gross carrying amount, beginning balance	2,350,223	2,056,470
Adjustments to goodwill, acquisitions	(629)	293,380
Adjustments to goodwill, foreign exchange	33,536	373
Gross carrying amount, ending balance	2,383,130	2,350,223
Manufacturing
Goodwill [Roll Forward]
Gross carrying amount, beginning balance	138,756	138,695
Adjustments to goodwill, acquisitions	0	0
Adjustments to goodwill, foreign exchange	4,523	61
Gross carrying amount, ending balance	$ 143,279	$ 138,756

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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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.

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