Business Combinations and Asset Purchases (Fair Values of the Business Combinations and Allocations for the Acquisitions Completed) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2022	Dec. 31, 2023	Jan. 01, 2023
Business Acquisition [Line Items]
Goodwill	$ 6,627,119	$ 6,533,550	$ 6,481,768
BioLegend [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid	3,336,115
Less: cash acquired	292,377
Business Combination, Consideration Transferred	5,688,964
Current assets	184,704
Property, plant and equipment	147,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	9,330
Goodwill	3,509,931
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Total	(668,919)
Liabilities assumed	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	(37,461)
Total	5,688,964
Business Combination, Consideration Transferred, Liabilities Incurred	6,857
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	2,638,369
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	0
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred, Contingent Consideration at Fair Value	0
Business Acquisition, Cost of Acquired Entity, Cash Paid Including Working Capital And Other Adjustments	0
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
Fiscal Year 2021 Acquisitions (Excluding BioLegend) [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid	1,128,584
Less: cash acquired	195,010
Business Combination, Consideration Transferred	981,698
Current assets	71,840
Property, plant and equipment	26,507
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	15,527
Goodwill	545,262
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Total	(80,923)
Liabilities assumed	(4,628)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	(61,925)
Total	981,698
Business Combination, Consideration Transferred, Liabilities Incurred	2,910
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	(1,197)
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred, Contingent Consideration at Fair Value	45,031
Business Acquisition, Cost of Acquired Entity, Cash Paid Including Working Capital And Other Adjustments	183
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
Fiscal Year 2021 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	318,600
License | BioLegend [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	8,979
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
Customer Relationships and Backlog [Member] | BioLegend [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	1,714,800
Customer Relationships and Backlog [Member] | Fiscal Year 2021 Acquisitions (Excluding BioLegend) [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	141,670
Trade Names and Patents [Member] | BioLegend [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	38,000
Trade Names and Patents [Member] | Fiscal Year 2021 Acquisitions (Excluding BioLegend) [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	39,476
Core technology and Clone Library [Member] | BioLegend [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	782,400
Core technology and Clone Library [Member] | Fiscal Year 2021 Acquisitions (Excluding BioLegend) [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	290,089
Diagnostics [Member]
Business Acquisition [Line Items]
Goodwill	$ 1,970,350	$ 1,945,612	$ 1,930,193