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BUSINESS COMBINATIONS - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 03, 2020 | Aug. 28, 2019 | Apr. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019 | Dec. 28, 2019
HemaCare Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proposed purchase price | $ 379,800 |  |  |  |  |  |  |
Purchase price allocation | 376,721 |  |  |  |  |  |  |
Cash acquired | $ 3,100 |  |  |  |  |  |  |
Integration related costs and transaction costs |  |  |  | $ 100 |  | $ 5,800 |  |
Actual revenue from acquiree |  |  |  | 6,400 |  | 18,700 |  |
Operating income (loss) from acquiree |  |  |  | (5,900) |  | (8,100) |  |
Citoxlab |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proposed purchase price |  |  | $ 527,100 |  |  |  |  |
Purchase price allocation |  |  | 490,357 |  |  |  |  |
Cash acquired |  |  | 36,700 |  |  |  |  |
Integration related costs and transaction costs |  |  |  | 1,200 | $ 12,100 | 2,500 | $ 17,200 |
Goodwill, amount expected to be deductible for tax purposes |  |  | $ 7,200 |  |  |  |  |
Other Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proposed purchase price |  | $ 23,400 |  |  |  |  |  |
Purchase price allocation |  | 23,063 |  |  |  |  |  |
Cash acquired |  | 300 |  |  |  |  |  |
Integration related costs and transaction costs |  |  |  | $ 0 | $ 1,100 | 0 | 1,100 |
Prepayments for future purchases and other post-closing adjustments |  | $ 4,000 |  |  |  |  |  |
Depreciation and Amortization Expense | HemaCare Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  |  | $ 400 | 6,400 |
Depreciation and Amortization Expense | Citoxlab |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  |  |  | 4,000 |
Interest Expense | HemaCare Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  |  |  | 6,100 |
Interest Expense | Citoxlab |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  |  |  | $ 1,200 |
Supplier |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity interest |  |  |  |  |  |  |  | 80.00%
Noncontrolling interest ownership percentage |  |  |  |  |  |  |  | 20.00%
Supplier | Other Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity interest |  | 80.00% |  |  |  |  |  |
Noncontrolling interest ownership percentage |  | 20.00% |  |  |  |  |  |

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