Industry Segment Information (Schedule of Sales and Operating Income by Operating Segment, Excluding Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,229,569	$ 1,228,471	$ 2,489,011	$ 2,536,160
Operating income (loss) from continuing operations	250,858	332,488	505,703	800,264
Interest and other expense (income), net	26,386	6,431	63,631	(6,275)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	224,472	326,057	442,072	806,539
Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	816,064	767,759	1,683,009	1,579,311
Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	413,505	460,712	806,002	956,849
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss) from continuing operations	(20,486)	(17,947)	(38,168)	(34,585)
Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	569,028	715,642	1,226,104	1,568,722
Operating income (loss) from continuing operations	201,232	286,280	459,244	727,747
Diagnostics [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	354,572	449,674	812,642	993,971
Diagnostics [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	214,456	265,968	413,462	574,751
Discovery & Analytical Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	660,541	512,829	1,262,907	967,438
Operating income (loss) from continuing operations	70,112	64,155	84,627	107,102
Discovery & Analytical Solutions [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	461,492	318,085	870,367	585,340
Discovery & Analytical Solutions [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 199,049	$ 194,744	$ 392,540	$ 382,098