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BUSINESS COMBINATIONS - Narrative (Details) $ in Thousands, £ in Millions |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Mar. 30, 2021 USD ($) | Mar. 30, 2021 GBP (£) | Mar. 29, 2021 USD ($) | Mar. 03, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 06, 2020 USD ($) | Jan. 03, 2020 USD ($) | Mar. 27, 2021 USD ($) | Mar. 28, 2020 USD ($) | Dec. 26, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 1,890,630 |  | $ 1,809,168
Retrogenix Limited |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Integration related costs and transaction costs |  |  |  |  |  |  |  | 800 |  |
Retrogenix Limited | Subsequent Event |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price | $ 48,000 | £ 35 |  |  |  |  |  |  |  |
Consideration contingent upon future performance | $ 7,000 | £ 5 |  |  |  |  |  |  |  |
Cognate BioServices, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Integration related costs and transaction costs |  |  |  |  |  |  |  | 7,200 |  |
Cognate BioServices, Inc. | Subsequent Event |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 875,000 |  |  |  |  |  |  |
Distributed Bio, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 97,000 |  |  |  |  |
Consideration contingent upon future performance |  |  |  |  | 21,000 |  |  |  |  |
Contingent consideration liability |  |  |  |  | 14,000 |  |  |  |  |
Purchase price allocation |  |  |  |  | 97,030 |  |  |  |  |
Cash acquired |  |  |  |  | 800 |  |  |  |  |
Integration related costs and transaction costs |  |  |  |  |  |  |  | 700 |  |
Cash portion of consideration transferred |  |  |  |  | 80,800 |  |  |  |  |
Payments to settle promissory note |  |  |  |  | 3,000 |  |  |  |  |
Goodwill |  |  |  |  | $ 71,585 |  |  |  |  |
Weighted-average amortization life |  |  |  |  | 7 years |  |  |  |  |
Definite-lived intangible assets |  |  |  |  | $ 24,540 |  |  |  |  |
Property, plant and equipment |  |  |  |  | $ 2,382 |  |  |  |  |
Cellero, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 37,400 |  |  |  |
Purchase price allocation |  |  |  |  |  | 36,850 |  |  |  |
Cash acquired |  |  |  |  |  | 500 |  |  |  |
Integration related costs and transaction costs |  |  |  |  |  |  |  | 400 |  |
Goodwill, amount expected to be deductible for tax purposes |  |  |  |  |  | 10,800 |  |  |  |
Goodwill |  |  |  |  |  | $ 19,457 |  |  |  |
Weighted-average amortization life |  |  |  |  |  | 12 years |  |  |  |
Definite-lived intangible assets |  |  |  |  |  | $ 16,230 |  |  |  |
Property, plant and equipment |  |  |  |  |  | $ 1,648 |  |  |  |
HemaCare Corporation |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 379,800 |  |  |
Purchase price allocation |  |  |  |  |  |  | 376,721 |  |  |
Cash acquired |  |  |  |  |  |  | 3,100 |  |  |
Integration related costs and transaction costs |  |  |  |  |  |  |  | $ 100 | $ 5,700 |
Goodwill |  |  |  |  |  |  | $ 210,196 |  |  |
Weighted-average amortization life |  |  |  |  |  |  | 18 years |  |  |
Definite-lived intangible assets |  |  |  |  |  |  | $ 183,540 |  |  |
Property, plant and equipment |  |  |  |  |  |  | $ 10,033 |  |  |
Other Acquisitions |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 35,600 |  |  |  |  |  |
Contingent consideration liability |  |  |  | 15,900 |  |  |  |  |  |
Cash portion of consideration transferred |  |  |  | 19,700 |  |  |  |  |  | $ 5,500
Goodwill |  |  |  | 17,300 |  |  |  |  |  |
Definite-lived intangible assets |  |  |  | 15,200 |  |  |  |  |  |
Property, plant and equipment |  |  |  | $ 3,000 |  |  |  |  |  |
Other Acquisitions | Supplier relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average amortization life |  |  |  | 4 years |  |  |  |  |  |
Other Acquisitions | Maximum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  |  | $ 17,500 |  |  |  |  |  |
Depreciation and Amortization Expense | HemaCare Corporation |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  |  |  |  |  | $ 200 |

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