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BUSINESS COMBINATIONS - Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
HemaCare Corporation
Business Acquisition [Line Items]
Revenue	$ 682,584	$ 668,095	$ 1,389,661	$ 1,281,551
Net income attributable to common shareholders	$ 67,383	42,467	$ 123,088	94,654
Citoxlab
Business Acquisition [Line Items]
Revenue		673,645		1,325,483
Net income attributable to common shareholders		$ 53,625		$ 114,653

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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