Goodwill and Intangible Assets, Net (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Net [Line Items]
Total amortization expense related to finite-lived intangible assets	$ 164,300	$ 135,900	$ 73,700
Future Amortization Expense, Year One	188,800
Future Amortization Expense, Year Two	173,000
Future Amortization Expense, Year Three	156,600
Future Amortization Expense, Year Four	132,600
Future Amortization Expense, Year Five	111,300
Finite-Lived Intangible Assets, Net	1,212,702	1,129,083
Goodwill	$ 3,111,227	2,952,608	3,002,198
Impairment Testing Date	Jan. 01, 2019
Trade Names And Trademarks [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	$ 47,702	44,345
Licenses [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	8,763	7,755
Discovery & Analytical Solutions [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	361,777	162,388
Goodwill	1,498,820	1,334,992	1,344,235
Discovery & Analytical Solutions [Member] | Trade Names And Trademarks [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	16,227	8,083
Discovery & Analytical Solutions [Member] | Licenses [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	2,786	5,802
Diagnostics [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	850,925	966,695
Goodwill	1,612,407	1,617,616	$ 1,657,963
Diagnostics [Member] | Trade Names And Trademarks [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	31,475	36,262
Diagnostics [Member] | Licenses [Member]
Goodwill and Intangible Assets Net [Line Items]
Finite-Lived Intangible Assets, Net	$ 5,977	$ 1,953