Restructuring and Contract Termination Charges, Net Restructuring and Contract Termination Charges, Net (Schedule of Initial Charges) (Details) $ in Thousands	3 Months Ended											12 Months Ended
	Jan. 03, 2021 USD ($)	Oct. 04, 2020 USD ($) employees	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	Dec. 30, 2018 USD ($) employees	Sep. 30, 2018 USD ($) employees	Apr. 01, 2018 USD ($) employees	Jan. 03, 2021 USD ($)	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net	$ (3,062)	$ 4,059	$ 1,158	$ 5,858	$ 1,560	$ 14,068	$ 6,161	$ 7,639				$ 8,013	$ 29,428	$ 11,144
Q3 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees		23
Restructuring and other costs, 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 other costs, 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 other costs, 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 other costs, 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 other costs, 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 other costs, net								$ 7,460
Q4 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees									1
Restructuring and other costs, net									$ 348
Q3 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees										61
Restructuring and other costs, net										$ 1,764
Q1 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees											47
Restructuring and other costs, net											$ 5,998
Diagnostics [Member] | Severance [Member] | Q3 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net		901
Diagnostics [Member] | Severance [Member] | Q1 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net				1,134
Diagnostics [Member] | Severance [Member] | Q4 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net					2,404
Diagnostics [Member] | Severance [Member] | Q3 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net						2,641
Diagnostics [Member] | Severance [Member] | Q2 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net							1,129
Diagnostics [Member] | Severance [Member] | Q1 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net								1,459
Diagnostics [Member] | Severance [Member] | Q4 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net									0
Diagnostics [Member] | Severance [Member] | Q3 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net										618
Diagnostics [Member] | Severance [Member] | Q1 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net											902
Diagnostics [Member] | Facility Closing [Member] | Q3 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net		0
Diagnostics [Member] | Facility Closing [Member] | Q1 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net				682
Diagnostics [Member] | Facility Closing [Member] | Q4 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net					0
Diagnostics [Member] | Facility Closing [Member] | Q3 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net						0
Diagnostics [Member] | Facility Closing [Member] | Q2 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net							0
Diagnostics [Member] | Facility Closing [Member] | Q1 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net								0
Diagnostics [Member] | Facility Closing [Member] | Q4 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net									0
Diagnostics [Member] | Facility Closing [Member] | Q3 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net										0
Diagnostics [Member] | Facility Closing [Member] | Q1 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net											0
Discovery & Analytical Solutions [Member] | Severance [Member] | Q3 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net		2,080
Discovery & Analytical Solutions [Member] | Severance [Member] | Q1 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net				2,312
Discovery & Analytical Solutions [Member] | Severance [Member] | Q4 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net					177
Discovery & Analytical Solutions [Member] | Severance [Member] | Q3 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net						11,156
Discovery & Analytical Solutions [Member] | Severance [Member] | Q2 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net							4,461
Discovery & Analytical Solutions [Member] | Severance [Member] | Q1 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net								6,001
Discovery & Analytical Solutions [Member] | Severance [Member] | Q4 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net									348
Discovery & Analytical Solutions [Member] | Severance [Member] | Q3 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net										1,146
Discovery & Analytical Solutions [Member] | Severance [Member] | Q1 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net											5,096
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q3 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net		$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q1 2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net				$ 92
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q4 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net					$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q3 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net						$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q2 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net							$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q1 2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net								$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q4 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net									$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q3 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net										$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q1 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net											$ 0