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. 05, 2020	Jun. 30, 2019	Jul. 05, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 811,718	$ 722,517	$ 1,464,114	$ 1,371,254
Operating income (loss) from continuing operations	175,639	91,735	220,321	145,065
Interest and other expense, net	10,812	19,908	20,805	36,473
Income from continuing operations before income taxes	164,827	71,827	199,516	108,592
Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	601,506	502,114	1,027,035	940,836
Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	210,212	220,403	437,079	430,418
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss) from continuing operations	(24,091)	(15,209)	(37,513)	(30,292)
Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	420,716	288,550	674,717	548,454
Operating income (loss) from continuing operations	160,300	49,255	189,891	80,741
Diagnostics [Member] \| Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	375,889	242,600	586,062	458,532
Diagnostics [Member] \| Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	44,827	45,950	88,655	89,922
Discovery & Analytical Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	391,002	433,967	789,397	822,800
Operating income (loss) from continuing operations	39,430	57,689	67,943	94,616
Discovery & Analytical Solutions [Member] \| Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	225,617	259,514	440,973	482,304
Discovery & Analytical Solutions [Member] \| Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 165,385	$ 174,453	$ 348,424	$ 340,496

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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