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ACQUISITIONS AND DIVESTITURES - Narrative (Details) - USD ($) |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended | 23 Months Ended |
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Nov. 30, 2023 | Jan. 27, 2023 | Apr. 05, 2022 | Oct. 12, 2021 | Jun. 28, 2021 | Mar. 30, 2021 | Mar. 29, 2021 | Mar. 03, 2021 | Dec. 31, 2020 | Dec. 25, 2021 | Dec. 30, 2023 | Dec. 31, 2022 | Dec. 25, 2021 | Dec. 26, 2020 | Nov. 30, 2023 | Dec. 20, 2022
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, net of cash acquired |  |  |  |  |  |  |  |  |  |  | $ 194,785,000 | $ 283,392,000 | $ 1,293,095,000 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 3,095,045,000 | 2,849,903,000 |  |  |  |
Gain on sale of business |  |  |  |  |  |  |  |  |  |  | (961,000) | 123,405,000 | $ 25,026,000 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Avian |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received from divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 167,300,000
Contingent consideration |  |  |  |  |  |  |  |  |  |  | 10,300,000 |  |  |  |  | $ 30,000,000
Gain on sale of business |  |  |  |  |  |  |  |  |  |  |  | 123,400,000 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | RMS Japan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received from divestiture |  |  |  | $ 70,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of business |  |  |  |  |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |
Cash proceeds from divestiture |  |  |  | 7,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Pension over funding and other post-closing adjustments |  |  |  | 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | CDMO Sweden |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received from divestiture |  |  |  | 59,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  | 15,300,000 |  |  |  |  |  |  |  | $ 7,500,000 |  |  |  |
Cash proceeds from divestiture |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Disposal Group, Disposed of by Sale, Not Discontinued Operations | CDMO Sweden |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase obligation |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Noveprim Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 41.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 41.00% |
Equity interest acquired | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |
Business combination, equity stake percentage | 49.00% |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  | 49.00% |
Purchase of investments |  |  |  |  |  |  |  |  |  |  |  | $ 90,000,000 |  |  |  |
Contingent liability |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 374,800,000 |
Additional cash paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 144,600,000 |
Business combination, consideration transferred, other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 198,800,000 |
Gain in equity equal to the excess fair value of additional equity interest purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103,200,000 |
Contingent consideration | $ 33,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,300,000 |
Business combination deferred purchase price | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |
Adjustments for working capital/debt | 13,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,800,000 |
Consideration contingent upon future performance | $ 55,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,000,000 |
Business combination, remaining equity to purchase | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Call option term, period after sixth anniversary | 1 month |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 month |
Put option term, period after first anniversary | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |
Total purchase price allocation | $ 374,834,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 374,834,000 |
Goodwill | 172,349,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 172,349,000 |
Definite-lived intangible assets | $ 9,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,500,000 |
Weighted Average Amortization Life | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | $ 35,831,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,831,000 |
Noveprim Group | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, redemption price | 47,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,000,000 |
Noveprim Group | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, redemption price | $ 54,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 54,000,000 |
SAMDI Tech, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, equity stake percentage |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, net of cash acquired |  | $ 62,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of previously owned interest in acquiree |  | 12,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price allocation |  | 62,801,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 37,129,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Definite-lived intangible assets |  | $ 33,070,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Amortization Life |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | $ 593,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Explore BioLabs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired |  |  | $ 6,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price allocation |  |  | 284,521,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 215,752,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Definite-lived intangible assets |  |  | $ 70,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Amortization Life |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | $ 37,369,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Vigene |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 323,900,000 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | 34,500,000 |  |  |  |  |  | 0 | 0 |  |  |  |
Cash acquired |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  |  |  |  |
Total purchase price allocation |  |  |  |  | 323,879,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 239,681,000 |  |  |  |  |  |  |  |  |  |  |
Definite-lived intangible assets |  |  |  |  | $ 93,900,000 |  |  |  |  |  |  |  |  |  |  |
Weighted Average Amortization Life |  |  |  |  | 11 years |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  | $ 7,649,000 |  |  |  |  |  |  |  |  |  |  |
Vigene | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration contingent upon future performance |  |  |  |  | $ 57,500,000 |  |  |  |  |  |  |  |  |  |  |
Retrogenix |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 53,900,000 |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | 6,900,000 |  |  |  |  |  |  |  |  |  |
Cash acquired |  |  |  |  |  | 8,500,000 |  |  |  |  |  |  |  |  |  |
Total purchase price allocation |  |  |  |  |  | 53,921,000 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 34,489,000 |  |  |  |  |  |  |  |  |  |
Definite-lived intangible assets |  |  |  |  |  | $ 22,126,000 |  |  |  |  |  |  |  |  |  |
Weighted Average Amortization Life |  |  |  |  |  | 11 years |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Cognate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 877,900,000 |  |  |  |  |  |  |  |  |
Cash acquired |  |  |  |  |  |  | 70,500,000 |  |  |  |  |  |  |  |  |
Total purchase price allocation |  |  |  |  |  |  | 877,865,000 |  |  |  |  |  |  |  |  |
Value of consideration not acquired |  |  |  |  |  |  | $ 15,700,000 |  |  |  |  |  |  |  |  |
Ownership percentage not acquired |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 611,555,000 |  |  |  |  |  |  |  |  |
Definite-lived intangible assets |  |  |  |  |  |  | $ 270,900,000 |  |  |  |  |  |  |  |  |
Weighted Average Amortization Life |  |  |  |  |  |  | 13 years |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  | $ 52,082,000 |  |  |  |  |  |  |  |  |
Distributed Bio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  | $ 97,000,000 |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  | 14,100,000 |  | 0 |  |  |  |  |
Cash acquired |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |
Total purchase price allocation |  |  |  |  |  |  |  |  | 97,030,000 |  |  |  |  |  |  |
Cash portion of consideration transferred |  |  |  |  |  |  |  |  | 80,800,000 |  |  |  |  |  |  |
Payments to settle promissory note |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |
Business combination, consideration liability contingent upon future performance, period |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Payment for contingent consideration |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 71,585,000 |  |  |  |  |  |  |
Definite-lived intangible assets |  |  |  |  |  |  |  |  | $ 24,540,000 |  |  |  |  |  |  |
Weighted Average Amortization Life |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  | $ 2,382,000 |  |  |  |  |  |  |
Distributed Bio | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration contingent upon future performance |  |  |  |  |  |  |  |  | $ 21,000,000 |  |  |  |  |  |  |
Other Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | $ 35,400,000 |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  | 15,900,000 |  |  | $ 0 |  |  |  |  |
Consideration contingent upon future performance |  |  |  |  |  |  |  | 17,500,000 |  |  |  |  |  |  |  |
Cash portion of consideration transferred |  |  |  |  |  |  |  | $ 19,500,000 |  |  |  |  |  | $ 5,500,000 |  |
Business combination, consideration liability contingent upon future performance, period |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 17,300,000 |  |  |  |  |  |  |  |
Definite-lived intangible assets |  |  |  |  |  |  |  | $ 15,200,000 |  |  |  |  |  |  |  |
Weighted Average Amortization Life |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |

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