Restructuring and Contract Termination Charges, Net (Schedule of Restructuring Plan Activity) (Details) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Oct. 04, 2020	Apr. 05, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net							$ 16,432	$ 8,013	$ 29,428
Facility Relocation [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates							$ 7,100	$ 4,300	$ 800
Q3 2020 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net	$ 2,981
Q1 2020 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net		$ 4,220
Q4 2019 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net			$ 2,581
Q3 2019 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net				$ 13,797
Q2 2019 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net					$ 5,590
Q1 2019 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net						$ 7,460
Diagnostics [Member] | Q3 2020 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net	901
Diagnostics [Member] | Q3 2020 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net	0
Diagnostics [Member] | Q1 2020 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net		1,134
Diagnostics [Member] | Q1 2020 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net		682
Diagnostics [Member] | Q4 2019 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net			2,404
Diagnostics [Member] | Q4 2019 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net			0
Diagnostics [Member] | Q3 2019 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net				2,641
Diagnostics [Member] | Q3 2019 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net				0
Diagnostics [Member] | Q2 2019 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net					1,129
Diagnostics [Member] | Q2 2019 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net					0
Diagnostics [Member] | Q1 2019 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net						1,459
Diagnostics [Member] | Q1 2019 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net						0
Discovery & Analytical Solutions [Member] | Q3 2020 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net	2,080
Discovery & Analytical Solutions [Member] | Q3 2020 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net	$ 0
Discovery & Analytical Solutions [Member] | Q1 2020 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net		2,312
Discovery & Analytical Solutions [Member] | Q1 2020 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net		$ 92
Discovery & Analytical Solutions [Member] | Q4 2019 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net			177
Discovery & Analytical Solutions [Member] | Q4 2019 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net			$ 0
Discovery & Analytical Solutions [Member] | Q3 2019 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net				11,156
Discovery & Analytical Solutions [Member] | Q3 2019 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net				$ 0
Discovery & Analytical Solutions [Member] | Q2 2019 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net					4,461
Discovery & Analytical Solutions [Member] | Q2 2019 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net					$ 0
Discovery & Analytical Solutions [Member] | Q1 2019 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net						6,001
Discovery & Analytical Solutions [Member] | Q1 2019 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other costs, net						$ 0