Restructuring and Contract Termination Charges, Net Restructuring and Contract Termination Charges, Net (Schedule of Initial Charges) (Details) $ in Thousands	3 Months Ended										6 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) employees	Oct. 01, 2017 USD ($) employees	Jul. 02, 2017 USD ($)	Apr. 02, 2017 USD ($) employees	Jan. 01, 2017 USD ($)	Oct. 02, 2016 USD ($) employees	Jul. 03, 2016 USD ($) employees	Apr. 03, 2016 USD ($)	Jan. 03, 2016 USD ($) employees	Jun. 28, 2015 USD ($) employees	Jul. 03, 2016 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)	Jan. 03, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	$ (263)	$ 3,269	$ 0	$ 9,651	$ 0	$ 656		$ 0			$ 4,468	$ 12,657	$ 5,124	$ 13,547
Q4 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees	29
Restructuring and contract termination charges, net	$ 1,935
Q3 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees		27
Restructuring and contract termination charges, net		$ 2,342
Q1 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees				90
Restructuring and contract termination charges, net				$ 6,697
Q3 2016 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						$ 1,820
Q2 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees							72
Restructuring and contract termination charges, net							$ 4,667
Q4 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees									174
Restructuring and contract termination charges, net									$ 11,580
Q2 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employees										95
Restructuring and contract termination charges, net										$ 5,963
Diagnostics [Member] | Severance [Member] | Q4 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	255
Diagnostics [Member] | Severance [Member] | Q3 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net		1,021
Diagnostics [Member] | Severance [Member] | Q1 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				1,631
Diagnostics [Member] | Severance [Member] | Q3 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net						41
Diagnostics [Member] | Severance [Member] | Q2 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net							561
Diagnostics [Member] | Severance [Member] | Q4 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net									1,315
Diagnostics [Member] | Severance [Member] | Q2 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net										673
Diagnostics [Member] | Facility Closing [Member] | Q4 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	0
Diagnostics [Member] | Facility Closing [Member] | Q3 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net		0
Diagnostics [Member] | Facility Closing [Member] | Q1 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				33
Diagnostics [Member] | Facility Closing [Member] | Q3 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net						0
Diagnostics [Member] | Facility Closing [Member] | Q2 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net							0
Diagnostics [Member] | Facility Closing [Member] | Q4 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net									0
Diagnostics [Member] | Facility Closing [Member] | Q2 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net										0
Discovery & Analytical Solutions [Member] | Severance [Member] | Q4 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	1,680
Discovery & Analytical Solutions [Member] | Severance [Member] | Q3 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net		1,321
Discovery & Analytical Solutions [Member] | Severance [Member] | Q1 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				5,000
Discovery & Analytical Solutions [Member] | Severance [Member] | Q3 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net						1,779
Discovery & Analytical Solutions [Member] | Severance [Member] | Q2 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net							4,106
Discovery & Analytical Solutions [Member] | Severance [Member] | Q4 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net									9,980
Discovery & Analytical Solutions [Member] | Severance [Member] | Q2 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net										5,290
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q4 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net	$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q3 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net		$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q1 2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net				$ 33
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q3 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net						$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q2 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net							$ 0
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q4 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net									$ 285
Discovery & Analytical Solutions [Member] | Facility Closing [Member] | Q2 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and contract termination charges, net										$ 0