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BUSINESS COMBINATIONS - Narrative (Details) - USD ($) $ in Thousands					3 Months Ended		9 Months Ended
	Aug. 06, 2020	Jan. 03, 2020	Aug. 28, 2019	Apr. 29, 2019	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019
Cellero, LLC
Business Acquisition [Line Items]
Proposed purchase price	$ 37,500
Purchase price allocation	36,950
Cash acquired	500
Integration related costs and transaction costs					$ 2,000		$ 2,000
Goodwill, amount expected to be deductible for tax purposes	$ 10,800
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		5,900
Actual revenue from acquiree					12,800		31,500
Operating income (loss) from acquiree					400		(7,700)
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					600	$ 1,900	3,100	$ 19,100
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	$ 2,100	0	3,200
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							$ 600	9,600
Depreciation and Amortization Expense | Citoxlab
Business Acquisition [Line Items]
Adjustments related to prior period								4,800
Interest Expense | HemaCare Corporation
Business Acquisition [Line Items]
Adjustments related to prior period								8,800
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%						20.00%
Supplier | Other Acquisitions
Business Acquisition [Line Items]
Equity interest			80.00%
Noncontrolling interest ownership percentage			20.00%

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