Restructuring and Lease Charges, Net (Schedule of Initial Charges) (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 04, 2021 USD ($) employees	Apr. 04, 2021 USD ($) employees	Oct. 04, 2020 USD ($) employees	Apr. 05, 2020 USD ($) employees	Jul. 04, 2021 USD ($)
Q2 2021 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees	25
Restructuring and contract termination charges, net	$ 1,532
Q1 2021 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees		77
Restructuring and contract termination charges, net		$ 5,556
Q3 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees			23
Restructuring and contract termination charges, net			$ 2,981
Q1 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees				32
Restructuring and contract termination charges, net				$ 4,220
Diagnostics [Member] | Employee Severance [Member] | Q2 2021 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	564
Diagnostics [Member] | Employee Severance [Member] | Q1 2021 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net		1,615
Diagnostics [Member] | Employee Severance [Member] | Q3 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net			901
Diagnostics [Member] | Employee Severance [Member] | Q1 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				1,134
Diagnostics [Member] | Facility Closing [Member] | Q2 2021 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	0
Diagnostics [Member] | Facility Closing [Member] | Q1 2021 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net		0
Diagnostics [Member] | Facility Closing [Member] | Q3 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net			0
Diagnostics [Member] | Facility Closing [Member] | Q1 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				682
Diagnostics [Member] | Facility Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net					$ 200
Discovery & Analytical Solutions [Member] | Employee Severance [Member] | Q2 2021 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	968
Discovery & Analytical Solutions [Member] | Employee Severance [Member] | Q1 2021 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net		3,941
Discovery & Analytical Solutions [Member] | Employee Severance [Member] | Q3 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net			2,080
Discovery & Analytical Solutions [Member] | Employee Severance [Member] | Q1 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				2,312
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q2 2021 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q1 2021 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net		$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q3 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net			$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q1 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				$ 92
Discovery & Analytical Solutions [Member] | Facility Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	$ 2,300				$ 2,500