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BUSINESS ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 03, 2020 | Aug. 28, 2019 | Apr. 29, 2019 | Mar. 28, 2020 | Mar. 30, 2019 | Dec. 28, 2019
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 |  |  |  | $ 5,700 |  |
Actual revenue from acquiree |  |  |  | 12,300 |  |
Operating income (loss) from acquiree |  |  |  | (2,200) |  |
Citoxlab |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  |  | $ 527,100 |  |  |
Purchase price allocation |  |  | 490,357 |  |  |
Cash acquired |  |  | 36,700 |  |  |
Integration related costs and transaction costs |  |  |  | 1,400 | $ 5,200 |
Actual revenue from acquiree |  |  |  | 45,300 | 2,500 |
Goodwill, amount expected to be deductible for tax purposes |  |  | $ 7,200 |  |  |
Other Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  | $ 23,400 |  |  |  |
Purchase price allocation |  | 23,063 |  |  |  |
Cash acquired |  | 300 |  |  |  |
Integration related costs and transaction costs |  |  |  | 0 |  |
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 |  |  |  | $ 200 | 3,200 |
Depreciation and Amortization Expense | Citoxlab |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  | 2,600 |
Interest Expense | HemaCare Corporation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Adjustments related to prior period |  |  |  |  | 2,800 |
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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