Business Combinations (Fair Values of the Business Combinations and Allocations for the Acquisitions Completed) (Details) - USD ($)	12 Months Ended
	Dec. 29, 2019	Apr. 05, 2020
Business Acquisition [Line Items]
Goodwill	$ 3,111,227,000	$ 3,051,694,000
Cisbio Bioassays SAS [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid	219,795,000
Business Combination, Consideration Transferred, Liabilities Incurred	0
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred, Contingent Consideration at Fair Value	0
Business Acquisition, Cost Of Acquired Entity, Working Capital Adjustments	(138,000)
Cash Acquired	12,542,000
Business Combination, Consideration Transferred	207,391,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	43,554,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	4,835,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	100,000
Goodwill		73,061,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Total		(34,606,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	207,391,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	(12,553,000)
Shandong Meizheng [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid	145,000,000
Business Combination, Consideration Transferred, Liabilities Incurred	6,446,000
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred, Contingent Consideration at Fair Value	(12,100,000)
Business Acquisition, Cost Of Acquired Entity, Working Capital Adjustments	(2,961,000)
Cash Acquired	2,108,000
Business Combination, Consideration Transferred	164,399,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	15,160,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	6,278,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	32,000
Goodwill		79,175,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Total		(21,849,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(706,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	164,399,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	(10,991,000)
Fiscal Year 2019 Other Acquisitions [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Cash Paid	45,042,000
Business Combination, Consideration Transferred, Liabilities Incurred	638,000
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred, Contingent Consideration at Fair Value	(634,000)
Business Acquisition, Cost Of Acquired Entity, Working Capital Adjustments	(302,000)
Cash Acquired	1,334,000
Business Combination, Consideration Transferred	45,282,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	4,042,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	727,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	481,000
Goodwill		17,005,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Total		(6,657,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(2,698,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	45,282,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	(3,295,000)
Core Technology [Member] | Cisbio Bioassays SAS [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		89,000,000
Core Technology [Member] | Shandong Meizheng [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		36,600,000
Core Technology [Member] | Fiscal Year 2019 Other Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	27,667,000
Trade Names [Member] | Cisbio Bioassays SAS [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	5,000,000
Trade Names [Member] | Shandong Meizheng [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	4,900,000
Trade Names [Member] | Fiscal Year 2019 Other Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	1,310,000
Customer Relationships [Member] | Cisbio Bioassays SAS [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	39,000,000
Customer Relationships [Member] | Shandong Meizheng [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		55,800,000
Customer Relationships [Member] | Fiscal Year 2019 Other Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	6,700,000
Diagnostics [Member]
Business Acquisition [Line Items]
Goodwill	1,612,407,000	1,582,380,000
Discovery & Analytical Solutions [Member]
Business Acquisition [Line Items]
Goodwill	$ 1,498,820,000	$ 1,469,314,000