ACQUISITIONS AND DIVESTITURES - Additional Information (Details) - USD ($) $ in Thousands											3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Oct. 12, 2021	Jun. 28, 2021	Mar. 30, 2021	Mar. 29, 2021	Mar. 03, 2021	Dec. 31, 2020	Aug. 06, 2020	Jan. 03, 2020	Aug. 28, 2019	Apr. 29, 2019	Dec. 25, 2021	Dec. 25, 2021	Dec. 25, 2021	Dec. 25, 2021	Dec. 26, 2020	Dec. 26, 2020	Dec. 28, 2019	Feb. 29, 2020
Business Acquisition [Line Items]
Goodwill											$ 2,711,881	$ 2,711,881	$ 2,711,881	$ 2,711,881	$ 1,809,168	$ 1,809,168	$ 1,540,565
Disposal Group, Disposed of by Sale, Not Discontinued Operations | RMS Japan Operations
Business Acquisition [Line Items]
Consideration received from divestiture	$ 73,500
Cash proceeds from divestiture	8,200
Pension over funding and other post-closing adjustments	3,600
Gain on divestiture											$ 22,700
Disposal Group, Disposed of by Sale, Not Discontinued Operations | CDMO Site
Business Acquisition [Line Items]
Consideration received from divestiture	59,600
Cash proceeds from divestiture	200
Contingent consideration	15,300
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Maximum | CDMO Site
Business Acquisition [Line Items]
Contingent consideration	25,000
Purchase obligation	$ 10,000
Supplier
Business Acquisition [Line Items]
Ownership percentage																	80.00%
Remaining ownership interest																	20.00%
Vigene Biosciences, Inc.
Business Acquisition [Line Items]
Purchase price		$ 323,900
Cash acquired		2,700
Contingent consideration		34,500
Consideration contingent upon future performance		$ 57,500
Transaction and integration costs														5,300
Revenue since acquisition												109,900
Operating income (loss) since acquisition												$ 2,500
Weighted average life		11 years
Definite-lived intangible assets		$ 93,900
Property, plant and equipment		7,649
Goodwill		239,681
Other long-term assets		$ 694
Vigene Biosciences, Inc. | Customer Relationships
Business Acquisition [Line Items]
Weighted average life		12 years
Retrogenix Limited
Business Acquisition [Line Items]
Purchase price			$ 53,900
Cash acquired			8,500
Consideration contingent upon future performance			$ 6,900
Transaction and integration costs														1,800
Weighted average life			11 years
Definite-lived intangible assets			$ 22,126
Property, plant and equipment			400
Goodwill			34,489
Other long-term assets			$ 1,385
Retrogenix Limited | Customer Relationships
Business Acquisition [Line Items]
Weighted average life			13 years
Cognate BioServices, Inc.
Business Acquisition [Line Items]
Cash acquired				$ 70,500
Transaction and integration costs														27,100
Revenue since acquisition													109,900
Operating income (loss) since acquisition													$ 2,500
Value of consideration not acquired				$ 15,700
Ownership percentage not acquired				2.00%
Weighted average life				13 years
Definite-lived intangible assets				$ 270,900
Property, plant and equipment				52,082
Goodwill				612,147
Other long-term assets				$ 6,098
Cognate BioServices, Inc. | Customer Relationships
Business Acquisition [Line Items]
Weighted average life				13 years
Distributed Bio, Inc.
Business Acquisition [Line Items]
Purchase price						$ 97,000
Cash acquired						800
Contingent consideration						14,000
Consideration contingent upon future performance						21,000
Transaction and integration costs														1,200	1,200
Cash portion of consideration transferred						80,800
Payments to settle promissory note						$ 3,000
Weighted average life						7 years
Definite-lived intangible assets						$ 24,540
Property, plant and equipment						2,382
Goodwill						71,585
Other long-term assets						$ 2,055
Distributed Bio, Inc. | Customer Relationships
Business Acquisition [Line Items]
Weighted average life						9 years
Other Acquisitions
Business Acquisition [Line Items]
Purchase price					$ 35,400				$ 23,000
Contingent consideration					15,900
Consideration contingent upon future performance					17,500
Cash portion of consideration transferred					$ 19,500										5,500
Future performance period					3 years
Definite-lived intangible assets					$ 15,200
Property, plant and equipment					3,000
Amount of pre-existing relationship for supply agreement									4,000
Goodwill					$ 17,300				13,000
Other long-term assets									12,000
Redeemable noncontrolling interest									$ 9,000
Other Acquisitions | Supplier Relationships
Business Acquisition [Line Items]
Weighted average life					4 years
Other Acquisitions | Supplier
Business Acquisition [Line Items]
Ownership percentage									80.00%
Remaining ownership interest									20.00%
Cognate BioServices, Inc. and Viegene Biosciences, Inc. | Depreciation and Amortization Expense
Business Acquisition [Line Items]
Adjustments to purchase price														24,500	24,200
Cognate BioServices, Inc. and Viegene Biosciences, Inc. | Interest Expense
Business Acquisition [Line Items]
Adjustments to purchase price														5,600	10,400
Cellero, LLC
Business Acquisition [Line Items]
Purchase price							$ 36,900
Cash acquired							$ 500
Transaction and integration costs														700	2,700
Weighted average life							12 years
Definite-lived intangible assets							$ 16,230
Property, plant and equipment							1,648
Goodwill resulting from transaction							10,800
Goodwill							19,457
Other long-term assets							$ 849
Cellero, LLC | Customer Relationships
Business Acquisition [Line Items]
Weighted average life							13 years
HemaCare Corporation
Business Acquisition [Line Items]
Purchase price								$ 376,700
Cash acquired								$ 3,100
Transaction and integration costs														700	6,100		$ 3,300
Revenue since acquisition																43,000
Operating income (loss) since acquisition																$ (8,100)
Weighted average life								18 years
Definite-lived intangible assets								$ 183,540
Property, plant and equipment								10,033
Goodwill								210,196
Other long-term assets								$ 5,920
HemaCare Corporation | Customer Relationships
Business Acquisition [Line Items]
Weighted average life								19 years
Citoxlab
Business Acquisition [Line Items]
Purchase price										$ 490,400
Cash acquired										$ 36,700
Contingent consideration																		$ 2,000
Transaction and integration costs														$ 2,300	$ 4,100		$ 20,700
Weighted average life										12 years
Definite-lived intangible assets										$ 162,400
Property, plant and equipment										88,605
Goodwill resulting from transaction										7,200
Goodwill										280,161
Other long-term assets										20,063
Redeemable noncontrolling interest										$ 4,035
Citoxlab | Customer Relationships
Business Acquisition [Line Items]
Weighted average life										13 years