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BUSINESS COMBINATIONS - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Aug. 06, 2020 | Jan. 03, 2020 | Aug. 28, 2019 | Apr. 29, 2019 | Apr. 03, 2018 | Jan. 11, 2018 | Dec. 29, 2018 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018 | Feb. 29, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 1,247,133 | $ 1,809,168 | $ 1,540,565 | $ 1,247,133 |
Distributed Bio |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Transaction and integration costs |  |  |  |  |  |  |  |  | 1,200 |  |  |
Distributed Bio | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ 83,000 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | $ 21,000 |  |  |  |  |  |  |  |  |  |  |
Cellero, LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 37,400 |  |  |  |  |  |  |  |  |  |
Transaction and integration costs |  |  |  |  |  |  |  |  | 2,700 |  |  |
Purchase price allocation |  | 36,850 |  |  |  |  |  |  |  |  |  |
Cash acquired |  | 500 |  |  |  |  |  |  |  |  |  |
Goodwill resulting from transaction |  | $ 10,800 |  |  |  |  |  |  |  |  |  |
Weighted average life |  | 12 years |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 19,457 |  |  |  |  |  |  |  |  |  |
Definite-lived intangible assets |  | $ 16,230 |  |  |  |  |  |  |  |  |  |
Cellero, LLC | Client relationships |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  | 13 years |  |  |  |  |  |  |  |  |  |
HemaCare Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 379,800 |  |  |  |  |  |  |  |  |
Transaction and integration costs |  |  |  |  |  |  |  |  | 6,100 | 3,300 |  |
Purchase price allocation |  |  | 376,721 |  |  |  |  |  |  |  |  |
Cash acquired |  |  | $ 3,100 |  |  |  |  |  |  |  |  |
Revenue since acquisition |  |  |  |  |  |  |  |  | 43,000 |  |  |
Operating income (loss) since acquisition |  |  |  |  |  |  |  |  | 8,100 |  |  |
Weighted average life |  |  | 18 years |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 210,196 |  |  |  |  |  |  |  |  |
Definite-lived intangible assets |  |  | $ 183,540 |  |  |  |  |  |  |  |  |
HemaCare Corporation | Client relationships |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  | 19 years |  |  |  |  |  |  |  |  |
HemaCare Corporation | Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  |  |  |  |  |  | 1,200 | 12,800 |  |
HemaCare Corporation | Interest Expense |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  |  |  |  |  |  |  | 10,800 |  |
Citoxlab |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 527,100 |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  | $ 2,000
Transaction and integration costs |  |  |  |  |  |  |  |  | 4,100 | 20,700 |  |
Purchase price allocation |  |  |  |  | 490,357 |  |  |  |  |  |  |
Cash acquired |  |  |  |  | 36,700 |  |  |  |  |  |  |
Goodwill resulting from transaction |  |  |  |  | $ 7,200 |  |  |  |  |  |  |
Weighted average life |  |  |  |  | 12 years |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 280,161 |  |  |  |  |  |  |
Definite-lived intangible assets |  |  |  |  | $ 162,400 |  |  |  |  |  |  |
Citoxlab | Client relationships |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  |  |  | 13 years |  |  |  |  |  |  |
Citoxlab | Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  |  |  |  |  |  |  | 5,700 | 9,400 |
Citoxlab | Interest Expense |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  |  |  |  |  |  |  | 1,200 | 4,100 |
MPI Research |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 829,700 |  |  |  |  |  |
Transaction and integration costs |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 16,500 |
Purchase price allocation |  |  |  |  |  | 800,800 |  |  |  |  |  |
Cash acquired |  |  |  |  |  | 27,700 |  |  |  |  |  |
Goodwill resulting from transaction |  |  |  |  |  | 4,100 |  |  |  |  |  |
Revenue since acquisition |  |  |  |  |  |  |  | 209,500 |  |  |  |
Operating income (loss) since acquisition |  |  |  |  |  |  |  | $ 33,400 |  |  |  |
Adjustments to purchase price |  |  |  |  |  | $ 1,200 |  |  |  |  |  |
Weighted average life |  |  |  |  |  | 12 years |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 441,656 |  |  |  |  |  |
Definite-lived intangible assets |  |  |  |  |  | $ 309,200 |  |  |  |  |  |
MPI Research | Client relationships |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average life |  |  |  |  |  | 13 years |  |  |  |  |  |
MPI Research | Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  |  |  |  |  |  |  |  | 14,100 |
MPI Research | Interest Expense |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to purchase price |  |  |  |  |  |  |  |  |  |  | $ 2,800 |
KWS BioTest Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 20,000 |  |  |  |  |
Weighted average life |  |  |  |  |  |  | 12 years |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 18,000 |  |  |  |  |
Definite-lived intangible assets |  |  |  |  |  |  | $ 4,000 |  |  |  |  |
Other Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 23,000 |  |  |  |  |  |  |  |
Amount of pre-existing relationship for supply agreement |  |  |  | 4,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 13,000 |  |  |  |  |  |  |  |
Supplier |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 80.00% |  |  |  |  |  |  |  |
Remaining ownership interest |  |  |  | 20.00% | 20.00% |  |  |  |  |  |  |
Supplier | Other Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 80.00% |  |  |  |  |  |  |  |
Remaining ownership interest |  |  |  | 20.00% |  |  |  |  |  |  |  |

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