Goodwill and Intangible Assets, Net (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Goodwill and Intangible Assets Net [Line Items]
Total amortization expense related to finite-lived intangible assets	$ 192,600	$ 164,300	$ 135,900
Future Amortization Expense, Year One	211,000
Future Amortization Expense, Year Two	191,400
Future Amortization Expense, Year Three	164,000
Future Amortization Expense, Year Four	139,900
Future Amortization Expense, Year Five	111,900
Finite-Lived Intangible Assets, Net	1,295,109	1,212,702
Goodwill	$ 3,447,114	3,111,227	2,952,608
Impairment Testing Date	January 1, 2020
Trade Names And Trademarks [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	$ 49,855	47,702
Licenses [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	6,248	8,763
Discovery & Analytical Solutions [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	491,871	361,777
Goodwill	1,755,887	1,498,820	1,334,992
Discovery & Analytical Solutions [Member] | Trade Names And Trademarks [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	19,284	16,227
Discovery & Analytical Solutions [Member] | Licenses [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	1,151	2,786
Diagnostics [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	803,238	850,925
Goodwill	1,691,227	1,612,407	$ 1,617,616
Diagnostics [Member] | Trade Names And Trademarks [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	30,571	31,475
Diagnostics [Member] | Licenses [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	5,097	$ 5,977
Tulip Diagnostics Private Limited [Member]
Goodwill and Intangible Assets Net [Line Items]
Goodwill	$ 77,800