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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. 04, 2021
Jul. 05, 2020
Jul. 04, 2021
Jul. 05, 2020
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,228,471 $ 811,718 $ 2,536,160 $ 1,464,114
Operating income (loss) from continuing operations 332,488 175,639 800,264 220,321
Interest and other expense (income), net 6,431 10,812 (6,275) 20,805
Income from continuing operations before income taxes 326,057 164,827 806,539 199,516
Product [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 767,759 601,506 1,579,311 1,027,035
Service [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 460,712 210,212 956,849 437,079
Corporate [Member]        
Segment Reporting Information [Line Items]        
Operating income (loss) from continuing operations (17,947) (24,091) (34,585) (37,513)
Diagnostics [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 715,642 420,716 1,568,722 674,717
Operating income (loss) from continuing operations 286,280 160,300 727,747 189,891
Diagnostics [Member] | Product [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 449,674 375,889 993,971 586,062
Diagnostics [Member] | Service [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 265,968 44,827 574,751 88,655
Discovery & Analytical Solutions [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 512,829 391,002 967,438 789,397
Operating income (loss) from continuing operations 64,155 39,430 107,102 67,943
Discovery & Analytical Solutions [Member] | Product [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 318,085 225,617 585,340 440,973
Discovery & Analytical Solutions [Member] | Service [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 194,744 $ 165,385 $ 382,098 $ 348,424