Industry Segment and Geographic Area Information Schedule of Depreciation, Amortization and Capital Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Schedule of Segment Reporting Information, by Segment [Line Items]
Depreciation and amortization expense	$ 246,507	$ 214,025	$ 180,588
Payments to Acquire Property, Plant, and Equipment	77,506	76,331	93,253
Diagnostics [Member]
Schedule of Segment Reporting Information, by Segment [Line Items]
Depreciation and amortization expense	149,738	136,476	107,434
Payments to Acquire Property, Plant, and Equipment	55,236	46,863	54,737
Discovery & Analytical Solutions [Member]
Schedule of Segment Reporting Information, by Segment [Line Items]
Depreciation and amortization expense	93,516	74,445	70,362
Payments to Acquire Property, Plant, and Equipment	20,217	27,778	34,852
Corporate [Member]
Schedule of Segment Reporting Information, by Segment [Line Items]
Depreciation and amortization expense	3,253	3,104	2,792
Payments to Acquire Property, Plant, and Equipment	2,053	1,690	3,664
All Segments [Member]
Schedule of Segment Reporting Information, by Segment [Line Items]
Depreciation and amortization expense	246,507	214,025	180,588
Payments to Acquire Property, Plant, and Equipment	$ 77,506	$ 76,331	$ 93,253