Restructuring and Lease Charges, Net (Schedule of Initial Charges) (Details) $ in Thousands	3 Months Ended						6 Months Ended
	Jul. 05, 2020 USD ($)	Apr. 05, 2020 USD ($) employees	Dec. 29, 2019 USD ($) employees	Sep. 29, 2019 USD ($) employees	Jun. 30, 2019 USD ($) employees	Mar. 31, 2019 USD ($) employees	Jul. 05, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 13,904		$ 13,880				$ 13,904
Restructuring and contract termination charges, net							6,804
Restructuring Reserve, Accrual Adjustment							212
Restructuring reserve Settled with Cash and Translation Adjustment							(6,992)
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
Q4 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees			22
Restructuring and contract termination charges, net			$ 2,581
Q3 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees				259
Restructuring and contract termination charges, net				$ 13,797
Q2 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees					44
Restructuring and contract termination charges, net					$ 5,590
Q1 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees						105
Restructuring and contract termination charges, net						$ 7,460
Employee Severance [Member] | Q1 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,655		0				1,655
Restructuring and contract termination charges, net							3,446
Restructuring Reserve, Accrual Adjustment							0
Restructuring reserve Settled with Cash and Translation Adjustment							(1,791)
Employee Severance [Member] | Q4 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	366		889				366
Restructuring and contract termination charges, net							0
Restructuring Reserve, Accrual Adjustment							(69)
Restructuring reserve Settled with Cash and Translation Adjustment							(454)
Employee Severance [Member] | Q3 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	4,513		6,311				4,513
Restructuring and contract termination charges, net							0
Restructuring Reserve, Accrual Adjustment							0
Restructuring reserve Settled with Cash and Translation Adjustment							(1,798)
Employee Severance [Member] | Q2 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	737		1,889				737
Restructuring and contract termination charges, net							0
Restructuring Reserve, Accrual Adjustment							0
Restructuring reserve Settled with Cash and Translation Adjustment							(1,152)
Employee Severance [Member] | Q1 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,460		2,129				1,460
Restructuring and contract termination charges, net							0
Restructuring Reserve, Accrual Adjustment							0
Restructuring reserve Settled with Cash and Translation Adjustment							(669)
Facility Closing [Member] | Q1 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	654		0				654
Restructuring and contract termination charges, net							774
Restructuring Reserve, Accrual Adjustment							0
Restructuring reserve Settled with Cash and Translation Adjustment							120
Facility Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	2,481		827				2,481
Restructuring and contract termination charges, net							2,584
Restructuring Reserve, Accrual Adjustment							0
Restructuring reserve Settled with Cash and Translation Adjustment							930
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] | Employee Severance [Member] | Q4 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net			2,404
Diagnostics [Member] | Employee Severance [Member] | Q3 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				2,641
Diagnostics [Member] | Employee Severance [Member] | Q2 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net					1,129
Diagnostics [Member] | Employee Severance [Member] | Q1 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net						1,459
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 Closing [Member] | Q4 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net			0
Diagnostics [Member] | Facility Closing [Member] | Q3 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				0
Diagnostics [Member] | Facility Closing [Member] | Q2 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net					0
Diagnostics [Member] | Facility Closing [Member] | Q1 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net						0
Diagnostics [Member] | Facility Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	300						400
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] | Employee Severance [Member] | Q4 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net			177
Discovery & Analytical Solutions [Member] | Employee Severance [Member] | Q3 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				11,156
Discovery & Analytical Solutions [Member] | Employee Severance [Member] | Q2 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net					4,461
Discovery & Analytical Solutions [Member] | Employee Severance [Member] | Q1 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net						6,001
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 Closing [Member] | Q4 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net			$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q3 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q2 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net					$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q1 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net						$ 0
Discovery & Analytical Solutions [Member] | Facility Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	$ 800						$ 2,200