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BUSINESS COMBINATIONS - Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
HemaCare Corporation
Business Acquisition [Line Items]
Revenue	$ 743,300	$ 677,993	$ 2,132,961	$ 1,959,544
Net income attributable to common shareholders	$ 102,802	70,722	$ 225,890	165,376
Citoxlab
Business Acquisition [Line Items]
Revenue		667,951		1,992,472
Net income attributable to common shareholders		$ 74,948		$ 189,601

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-Publisher FASB
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-SubTopic 10
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