Industry Segment Information (Schedule of Sales and Operating Income by Operating Segment, Excluding Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
Apr. 05, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 652,396	$ 648,737
Operating income (loss) from continuing operations	44,682	53,330
Interest and other expense, net	9,993	16,565
Income from continuing operations before income taxes	34,689	36,765
Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	425,529	438,722
Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	226,867	210,015
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss) from continuing operations	(13,422)	(15,083)
Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	254,001	259,904
Operating income (loss) from continuing operations	29,591	31,486
Diagnostics [Member] \| Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	210,173	215,932
Diagnostics [Member] \| Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	43,828	43,972
Discovery & Analytical Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	398,395	388,833
Operating income (loss) from continuing operations	28,513	36,927
Discovery & Analytical Solutions [Member] \| Product [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	215,356	222,790
Discovery & Analytical Solutions [Member] \| Service [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 183,039	$ 166,043

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
-Name Accounting Standards Codification
-Topic 606
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