Industry Segment Information (Schedule of Sales and Operating Income by Operating Segment, Excluding Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2021	Oct. 04, 2020	Oct. 03, 2021	Oct. 04, 2020
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,166,684	$ 964,025	$ 3,702,844	$ 2,428,139
Operating income (loss) from continuing operations	221,970	248,006	1,022,234	468,327
Interest and other expense, net	60,302	14,249	54,027	35,054
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	161,668	233,757	968,207	433,273
Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	785,869	736,846	2,365,180	1,763,881
Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	380,815	227,179	1,337,664	664,258
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss) from continuing operations	(23,079)	(18,502)	(57,664)	(56,015)
Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	653,805	540,402	2,222,527	1,215,119
Operating income (loss) from continuing operations	237,903	223,819	965,650	413,710
Diagnostics [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	467,413	491,290	1,461,384	1,077,352
Diagnostics [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	186,392	49,112	761,143	137,767
Discovery & Analytical Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	512,879	423,623	1,480,317	1,213,020
Operating income (loss) from continuing operations	7,146	42,689	114,248	110,632
Discovery & Analytical Solutions [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	318,456	245,556	903,796	686,529
Discovery & Analytical Solutions [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 194,423	$ 178,067	$ 576,521	$ 526,491