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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 |

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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