Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021	Jan. 02, 2022
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,229,569	$ 1,228,471	$ 2,489,011	$ 2,536,160
Contract with Customer, Liability, Current	50,943		50,943		$ 201,073
Contract with Customer, Liability, Revenue Recognized			(171,581)
Contract with Customer, Asset and Liability [Abstract]
Contract with Customer, Asset, Net, Current	58,687		58,687		72,117
Contract with Customer, Liability, Current	50,943		50,943		$ 201,073
Contract with Customer, Liability, Revenue Recognized			(171,581)
Unbilled Receivables Transferred To Accounts Receivables			(47,716)
Contract with Customer, Liability, Increase (Decrease)			21,451
Contract with Customer, Asset, Increase (Decrease)			34,286
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,021,631	884,913	2,037,465	1,826,681
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	207,938	343,558	451,546	709,479
Americas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	627,817	575,303	1,228,911	1,151,345
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	275,855	346,353	632,261	793,554
Asia [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	325,897	306,815	627,839	591,261
Discovery & Analytical Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	660,541	512,829	1,262,907	967,438
Discovery & Analytical Solutions [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	516,092	378,310	977,406	704,972
Discovery & Analytical Solutions [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	144,449	134,519	285,501	262,466
Discovery & Analytical Solutions [Member] | Americas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	302,207	206,938	575,365	382,053
Discovery & Analytical Solutions [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	159,620	145,576	317,858	281,034
Discovery & Analytical Solutions [Member] | Asia [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	198,714	160,315	369,684	304,351
Diagnostics [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	569,028	715,642	1,226,104	1,568,722
Diagnostics [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	176,900	192,500	289,600	398,000
Diagnostics [Member] | California Department of Public Health [Member] | Customer Concentration Risk [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	117,800
Contract with Customer, Asset and Liability [Abstract]
Contract with Customer, Liability, Revenue Recognized	117,800
Diagnostics [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	505,539	506,603	1,060,059	1,121,709
Diagnostics [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	63,489	209,039	166,045	447,013
Diagnostics [Member] | Americas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	325,610	368,365	653,546	769,292
Diagnostics [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	116,235	200,777	314,403	512,520
Diagnostics [Member] | Asia [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	127,183	146,500	258,155	286,910
Life Sciences [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	442,654	308,681	855,063	585,882
Life Sciences [Member] | Discovery & Analytical Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	442,654	308,681	855,063	585,882
Life Sciences [Member] | Diagnostics [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
Diagnostics [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	569,028	715,642	1,226,104	1,568,722
Diagnostics [Member] | Discovery & Analytical Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
Diagnostics [Member] | Diagnostics [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	569,028	715,642	1,226,104	1,568,722
Applied Markets [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	217,887	204,148	407,844	381,556
Applied Markets [Member] | Discovery & Analytical Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	217,887	204,148	407,844	381,556
Applied Markets [Member] | Diagnostics [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 0	$ 0	$ 0	$ 0