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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 9 Months Ended
Oct. 04, 2020
Sep. 29, 2019
Oct. 04, 2020
Sep. 29, 2019
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 964,025 $ 706,923 $ 2,428,139 $ 2,078,177
Operating income (loss) from continuing operations 248,006 78,660 468,327 223,725
Interest and other expense, net 14,249 15,406 35,054 51,879
Income from continuing operations before income taxes 233,757 63,254 433,273 171,846
Product [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 736,846 493,320 1,763,881 1,434,156
Service [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 227,179 213,603 664,258 644,021
Corporate [Member]        
Segment Reporting Information [Line Items]        
Operating income (loss) from continuing operations (18,502) (21,130) (56,015) (51,422)
Diagnostics [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 540,402 280,019 1,215,119 828,473
Operating income (loss) from continuing operations 223,819 47,443 413,710 128,184
Diagnostics [Member] | Product [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 491,290 237,202 1,077,352 695,734
Diagnostics [Member] | Service [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 49,112 42,817 137,767 132,739
Discovery & Analytical Solutions [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 423,623 426,904 1,213,020 1,249,704
Operating income (loss) from continuing operations 42,689 52,347 110,632 146,963
Discovery & Analytical Solutions [Member] | Product [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 245,556 256,118 686,529 738,422
Discovery & Analytical Solutions [Member] | Service [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 178,067 $ 170,786 $ 526,491 $ 511,282