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BUSINESS COMBINATIONS - Pro Forma Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 26, 2021 | Jun. 27, 2020 | Jun. 26, 2021 | Jun. 27, 2020
Cognate BioServices, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 914,607 | $ 706,250 | $ 1,767,096 | $ 1,434,708
Net income attributable to common shareholders | $ 96,365 | 74,408 | $ 138,712 | 85,249
HemaCare Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  | 682,584 |  | 1,389,661
Net income attributable to common shareholders |  | $ 67,383 |  | $ 123,088

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