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ACQUISITIONS AND DIVESTITURES - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 05, 2022 | Oct. 12, 2021 | Jun. 28, 2021 | Mar. 30, 2021 | Mar. 29, 2021 | Mar. 03, 2021 | Dec. 31, 2020 | Sep. 25, 2021 | Sep. 24, 2022 | Sep. 25, 2021 | Dec. 26, 2020 | Dec. 25, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 2,776,005 |  |  | $ 2,711,881
Disposal Group, Disposed of by Sale, Not Discontinued Operations | RMS Japan |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration received from divestiture |  | $ 70,900 |  |  |  |  |  |  |  |  |  |
Cash proceeds from divestiture |  | 7,900 |  |  |  |  |  |  |  |  |  |
Pension over funding and other post-closing adjustments |  | 3,800 |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | CDMO Sweden |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration received from divestiture |  | 59,600 |  |  |  |  |  |  |  |  |  |
Cash proceeds from divestiture |  | 200 |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | 15,300 |  |  |  |  |  |  | 7,500 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | CDMO Sweden | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | 25,000 |  |  |  |  |  |  |  |  |  |
Purchase obligation |  | $ 10,000 |  |  |  |  |  |  |  |  |  |
Explora BioLabs |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation | $ 284,521 |  |  |  |  |  |  |  |  |  |  |
Cash acquired | 6,600 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 215,752 |  |  |  |  |  |  |  |  |  |  |
Definite-lived intangible assets | $ 70,100 |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization life of intangible assets acquired | 12 years |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | $ 37,369 |  |  |  |  |  |  |  |  |  |  |
Vigene Biosciences, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  | $ 323,879 |  |  |  |  |  |  |  |  |
Cash acquired |  |  | 2,700 |  |  |  |  |  |  |  |  |
Purchase price |  |  | 323,900 |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  | 34,500 |  |  |  |  |  | 0 |  |  |
Goodwill |  |  | 239,681 |  |  |  |  |  |  |  |  |
Definite-lived intangible assets |  |  | $ 93,900 |  |  |  |  |  |  |  |  |
Weighted average amortization life of intangible assets acquired |  |  | 11 years |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | $ 7,649 |  |  |  |  |  |  |  |  |
Vigene Biosciences, Inc. | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration contingent upon future performance |  |  | $ 57,500 |  |  |  |  |  |  |  |  |
Retrogenix Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  | $ 53,921 |  |  |  |  |  |  |  |
Cash acquired |  |  |  | 8,500 |  |  |  |  |  |  |  |
Purchase price |  |  |  | 53,900 |  |  |  |  |  |  |  |
Contingent consideration liability |  |  |  | 6,900 |  |  |  |  |  |  |  |
Goodwill |  |  |  | 34,489 |  |  |  |  |  |  |  |
Definite-lived intangible assets |  |  |  | $ 22,126 |  |  |  |  |  |  |  |
Weighted average amortization life of intangible assets acquired |  |  |  | 11 years |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | $ 400 |  |  |  |  |  |  |  |
Cognate BioServices, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  | $ 877,865 |  |  |  |  |  |  |
Cash acquired |  |  |  |  | 70,500 |  |  |  |  |  |  |
Purchase price |  |  |  |  | 877,900 |  |  |  |  |  |  |
Value of consideration not acquired |  |  |  |  | $ 15,700 |  |  |  |  |  |  |
Ownership percentage not acquired |  |  |  |  | 2.00% |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 611,555 |  |  |  |  |  |  |
Definite-lived intangible assets |  |  |  |  | $ 270,900 |  |  |  |  |  |  |
Weighted average amortization life of intangible assets acquired |  |  |  |  | 13 years |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  | $ 52,082 |  |  |  |  |  |  |
Distributed Bio, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  | $ 97,030 |  |  |  |  |
Cash acquired |  |  |  |  |  |  | 800 |  |  |  |  |
Purchase price |  |  |  |  |  |  | 97,000 |  |  |  |  |
Contingent consideration liability |  |  |  |  |  |  | 14,100 |  | 0 |  |  |
Cash portion of consideration transferred |  |  |  |  |  |  | 80,800 |  |  |  |  |
Payments to settle promissory note |  |  |  |  |  |  | 3,000 |  |  |  |  |
Payments for contingent considerations |  |  |  |  |  |  |  |  | 7,000 |  |  |
Goodwill |  |  |  |  |  |  | 71,585 |  |  |  |  |
Definite-lived intangible assets |  |  |  |  |  |  | $ 24,540 |  |  |  |  |
Weighted average amortization life of intangible assets acquired |  |  |  |  |  |  | 7 years |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  | $ 2,382 |  |  |  |  |
Distributed Bio, Inc. | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration contingent upon future performance |  |  |  |  |  |  | $ 21,000 |  |  |  |  |
Other Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 35,400 |  |  |  |  |  |
Contingent consideration liability |  |  |  |  |  | 15,900 |  |  | $ 0 |  |  |
Cash portion of consideration transferred |  |  |  |  |  | 19,500 |  |  |  |  | $ 5,500 |
Goodwill |  |  |  |  |  | 17,300 |  |  |  |  |  |
Definite-lived intangible assets |  |  |  |  |  | $ 15,200 |  |  |  |  |  |
Weighted average amortization life of intangible assets acquired |  |  |  |  |  | 4 years |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  | $ 3,000 |  |  |  |  |  |
Other Acquisitions | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration contingent upon future performance |  |  |  |  |  | $ 17,500 |  |  |  |  |  |
Cognate BioServices, Inc. and Viegene Biosciences, Inc. | Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  |  |  |  | $ 4,300 |  | $ 17,600 |  |
Cognate BioServices, Inc. and Viegene Biosciences, Inc. | Interest expense |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  |  |  |  | $ 0 |  | $ 5,600 |  |

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