Restructuring and Lease Charges, Net (Schedule of Initial Charges) (Details) $ in Thousands	3 Months Ended
	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
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 15,123	$ 13,880
Restructuring and contract termination charges, net	5,646
Restructuring Reserve, Accrual Adjustment	212
Restructuring reserve Settled with Cash and Translation Adjustment	$ (4,615)
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	2,655	0
Restructuring and contract termination charges, net	3,446
Restructuring Reserve, Accrual Adjustment	0
Restructuring reserve Settled with Cash and Translation Adjustment	(791)
Employee Severance [Member] | Q4 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	849	889
Restructuring and contract termination charges, net	0
Restructuring Reserve, Accrual Adjustment	0
Restructuring reserve Settled with Cash and Translation Adjustment	(40)
Employee Severance [Member] | Q3 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	4,855	6,311
Restructuring and contract termination charges, net	0
Restructuring Reserve, Accrual Adjustment	0
Restructuring reserve Settled with Cash and Translation Adjustment	(1,456)
Employee Severance [Member] | Q2 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,032	1,889
Restructuring and contract termination charges, net	0
Restructuring Reserve, Accrual Adjustment	0
Restructuring reserve Settled with Cash and Translation Adjustment	(857)
Employee Severance [Member] | Q1 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,460	2,129
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	682	0
Restructuring and contract termination charges, net	774
Restructuring Reserve, Accrual Adjustment	0
Restructuring reserve Settled with Cash and Translation Adjustment	92
Facility Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,655	827
Restructuring and contract termination charges, net	1,426
Restructuring Reserve, Accrual Adjustment	0
Restructuring reserve Settled with Cash and Translation Adjustment	598
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	100
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	$ 1,300