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BUSINESS COMBINATIONS - Pro Forma Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019
HemaCare Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 682,584 | $ 668,095 | $ 1,389,661 | $ 1,281,551
Net income attributable to common shareholders | $ 67,383 | 42,467 | $ 123,088 | 94,654
Citoxlab |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  | 673,645 |  | 1,325,483
Net income attributable to common shareholders |  | $ 53,625 |  | $ 114,653

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