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BUSINESS COMBINATIONS - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Aug. 06, 2020	Jan. 03, 2020	Dec. 28, 2019	Aug. 28, 2019	Apr. 29, 2019
Business Acquisition [Line Items]
Goodwill	$ 1,777,642			$ 1,540,565
Cellero, LLC
Business Acquisition [Line Items]
Trade receivables		$ 1,525
Inventories		551
Other current assets (excluding cash)		182
Property, plant and equipment		1,648
Goodwill		19,532
Definite-lived intangible assets		16,230
Other long-term assets		849
Current liabilities		(1,360)
Deferred tax liabilities		(1,467)
Other long-term liabilities		(740)
Total purchase price allocation		$ 36,950
HemaCare Corporation
Business Acquisition [Line Items]
Trade receivables			$ 6,451
Inventories			8,468
Other current assets (excluding cash)			3,494
Property, plant and equipment			10,033
Goodwill			210,196
Definite-lived intangible assets			183,540
Other long-term assets			5,920
Current liabilities			(5,188)
Deferred tax liabilities			(38,529)
Other long-term liabilities			(7,664)
Total purchase price allocation			$ 376,721
Citoxlab
Business Acquisition [Line Items]
Trade receivables						$ 35,405
Inventories						5,282
Other current assets (excluding cash)						13,917
Property, plant and equipment						88,605
Goodwill						280,161
Definite-lived intangible assets						162,400
Other long-term assets						20,063
Deferred revenue						(15,278)
Current liabilities						(46,081)
Deferred tax liabilities						(27,458)
Other long-term liabilities						(22,624)
Redeemable noncontrolling interest						(4,035)
Total purchase price allocation						$ 490,357
Other Acquisitions
Business Acquisition [Line Items]
Trade receivables					$ 189
Inventories					7,644
Property, plant and equipment					1,462
Goodwill					12,591
Other long-term assets					11,849
Current liabilities					(441)
Deferred tax liabilities					(1,253)
Other long-term liabilities					(238)
Redeemable noncontrolling interest					(8,740)
Total purchase price allocation					$ 23,063

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