Business Combinations (Fair Values of the Business Combinations and Allocations for the Acquisitions Completed) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Apr. 04, 2021	Oct. 03, 2021	Jan. 03, 2021
Business Acquisition [Line Items]
Goodwill		$ 7,420,271	$ 3,447,114
Fiscal Year 2021 Other Acquisitions [Member] | United States of America, Dollars
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid Including Working Capital And Other Adjustments		296,000
Fiscal Year 2021 Acquisitions (Excluding BioLegend) [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid		1,118,884
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		0
Business Combination, Consideration Transferred, Liabilities Incurred		910
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred, Contingent Consideration at Fair Value		(34,131)
Cash Acquired		195,010
Business Combination, Consideration Transferred		958,915
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets		73,933
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		26,507
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets		15,564
Goodwill		527,402
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Total		(86,471)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue		(1,197)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		(4,628)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt		(58,594)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		958,915
Fiscal Year 2021 Acquisitions (Excluding BioLegend) [Member] | United States of America, Dollars
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid Including Working Capital And Other Adjustments		1,200,000
BioLegend [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid		3,335,753
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		2,638,369
Business Combination, Consideration Transferred, Liabilities Incurred		6,857
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred, Contingent Consideration at Fair Value		0
Cash Acquired		292,377
Business Combination, Consideration Transferred		5,688,602
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets		184,541
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		147,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets		9,330
Goodwill		3,511,498
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Total		(669,906)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt		(38,240)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		5,688,602
BioLegend [Member] | United States of America, Dollars
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid Including Working Capital And Other Adjustments		5,700,000
Oxford Immunotec [Member] | United States of America, Dollars
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid Including Working Capital And Other Adjustments		590,900
Nexcelom Bioscience [Member] | United States of America, Dollars
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid Including Working Capital And Other Adjustments		267,100
Horizon Discovery Group plc [Member] | United States of America, Dollars
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid Including Working Capital And Other Adjustments	$ 399,800
Fiscal Year 2020 Acquisitions [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid	437,661
Business Combination, Consideration Transferred, Liabilities Incurred	1,660
Business Acquisition, Cost Of Acquired Entity, Working Capital Adjustments	384
Cash Acquired	(26,840)
Business Combination, Consideration Transferred	412,097
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets			35,532
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			20,302
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets			18,114
Goodwill			221,960
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Total			(27,142)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue			(2,031)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			(45,171)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			412,097
Fiscal Year 2020 Acquisitions [Member] | United States of America, Dollars
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid Including Working Capital And Other Adjustments	438,900
Fiscal Year 2020 Other Acquisitions | United States of America, Dollars
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid Including Working Capital And Other Adjustments	$ 39,100
Core Technology [Member] | Fiscal Year 2021 Acquisitions (Excluding BioLegend) [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		285,609
Core Technology [Member] | BioLegend [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		782,400
Core Technology [Member] | Fiscal Year 2020 Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			65,730
Trade Names [Member] | Fiscal Year 2021 Acquisitions (Excluding BioLegend) [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		39,620
Trade Names [Member] | BioLegend [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		38,000
Trade Names [Member] | Fiscal Year 2020 Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			5,580
Customer Relationships [Member] | Fiscal Year 2021 Acquisitions (Excluding BioLegend) [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		141,170
Customer Relationships [Member] | BioLegend [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		1,714,800
Customer Relationships [Member] | Fiscal Year 2020 Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			108,523
In-process Research and Development [Member] | Fiscal Year 2020 Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			10,700
License | Fiscal Year 2021 Acquisitions (Excluding BioLegend) [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		0
License | BioLegend [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		8,979
Diagnostics [Member]
Business Acquisition [Line Items]
Goodwill		1,979,703	1,691,227
Discovery & Analytical Solutions [Member]
Business Acquisition [Line Items]
Goodwill		$ 5,440,568	$ 1,755,887