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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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