Restructuring and Contract Termination Charges, Net (Schedule of Restructuring Plan Activity) (Details) (USD $)	3 Months Ended									12 Months Ended
	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 28, 2014		Dec. 29, 2013	Dec. 30, 2012	Jan. 01, 2012
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										$ 13,390,000		$ 33,892,000	$ 25,051,000
Amounts paid and foreign currency translation										(25,095,000)		(26,104,000)	(20,190,000)
Ending balance	23,830,000				35,535,000					23,830,000		35,535,000	27,747,000	22,886,000
Restructuring and contract termination charges, net	(579,000)	11,092,000	742,000	2,135,000	10,211,000	1,124,000	19,247,000		3,310,000	13,390,000		33,892,000	25,051,000
Employee Severance and Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										11,845,000		33,196,000	23,581,000
Amounts paid and foreign currency translation										(23,554,000)		(25,112,000)	(17,249,000)
Ending balance	23,526,000				35,235,000					23,526,000		35,235,000	27,151,000	20,819,000
Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										1,545,000		696,000	1,470,000
Amounts paid and foreign currency translation										(1,541,000)		(992,000)	(2,941,000)
Ending balance	304,000				300,000					304,000		300,000	596,000	2,067,000
2014 Contract Termination Charges [Member] | Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net										1,545,000
Q3 2014 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net		13,051,000
Q3 2014 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										13,051,000		0	0
Amounts paid and foreign currency translation										(2,992,000)		0	0
Ending balance	10,059,000				0					10,059,000		0	0	0
Q2 2014 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net			735,000
Q2 2014 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										735,000		0	0
Amounts paid and foreign currency translation										(484,000)		0	0
Ending balance	251,000				0					251,000		0	0	0
Q1 2014 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net				567,000
Q1 2014 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										567,000		0	0
Amounts paid and foreign currency translation										(475,000)		0	0
Ending balance	92,000				0					92,000		0	0	0
2013 Contract Termination Charges [Member] | Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net												696,000
Q4 2013 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net					11,179,000
Q4 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										(121,000)	[1]	3,908,000	0
Amounts paid and foreign currency translation										(1,541,000)		(1,921,000)	0
Ending balance	325,000				1,987,000					325,000		1,987,000	0	0
Q4 2013 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										1,055,000	[1]	7,271,000	0
Amounts paid and foreign currency translation										(2,106,000)		(417,000)	0
Ending balance	5,803,000				6,854,000					5,803,000		6,854,000	0	0
Q3 2013 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net						532,000
Q3 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										0		394,000	0
Amounts paid and foreign currency translation										(137,000)		(257,000)	0
Ending balance	0				137,000					0		137,000	0	0
Q3 2013 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										0		138,000	0
Amounts paid and foreign currency translation										0		(138,000)	0
Ending balance	0				0					0		0	0	0
Q2 2013 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net							18,704,000
Q2 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										(796,000)	[2]	18,704,000	0
Amounts paid and foreign currency translation										(10,373,000)		(5,954,000)	0
Ending balance	1,581,000				12,750,000					1,581,000		12,750,000	0	0
Q2 2013 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										184,000	[2]	572,000	0
Amounts paid and foreign currency translation										(184,000)		(572,000)	0
Ending balance	0				0					0		0	0	0
Q1 2013 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net									2,585,000
Q1 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										(208,000)	[3]	2,585,000	0
Amounts paid and foreign currency translation										0		(2,377,000)	0
Ending balance	0				208,000					0		208,000	0	0
Previous restructuring and integration plans [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges and Changes in Estimates										(2,622,000)	[4]	(376,000)	23,581,000
Amounts paid and foreign currency translation										5,262,000		13,476,000	17,249,000
Ending balance	5,415,000				13,299,000					5,415,000		13,299,000	27,151,000	20,819,000
Human Health [Member] | 2014 Contract Termination Charges [Member] | Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net										0
Human Health [Member] | Q3 2014 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net		6,863,000
Human Health [Member] | Q3 2014 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net		0
Human Health [Member] | Q2 2014 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net			460,000
Human Health [Member] | Q2 2014 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net			0
Human Health [Member] | Q1 2014 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net				370,000
Human Health [Member] | Q1 2014 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net				0
Human Health [Member] | 2013 Contract Termination Charges [Member] | Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net												0
Human Health [Member] | Q4 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Change in estimates										(100,000)
Restructuring and contract termination charges, net					902,000
Human Health [Member] | Q4 2013 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net					7,271,000
Human Health [Member] | Q3 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net						394,000
Human Health [Member] | Q3 2013 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net						138,000
Human Health [Member] | Q2 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Change in estimates										(300,000)
Restructuring and contract termination charges, net						600,000	9,395,000	[5]
Human Health [Member] | Q2 2013 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Change in estimates										100,000
Restructuring and contract termination charges, net							522,000
Human Health [Member] | Q1 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Change in estimates										(200,000)
Restructuring and contract termination charges, net									2,340,000
Human Health [Member] | Q1 2013 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net									0
Human Health [Member] | Previous restructuring and integration plans [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Change in estimates										(1,600,000)
Human Health [Member] | Previous restructuring and integration plans [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Change in estimates										100,000
Environmental Health [Member] | 2014 Contract Termination Charges [Member] | Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net										1,545,000
Environmental Health [Member] | Q3 2014 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net		6,188,000
Environmental Health [Member] | Q3 2014 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net		0
Environmental Health [Member] | Q2 2014 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net			275,000
Environmental Health [Member] | Q2 2014 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net			0
Environmental Health [Member] | Q1 2014 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net				197,000
Environmental Health [Member] | Q1 2014 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net				0
Environmental Health [Member] | 2013 Contract Termination Charges [Member] | Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net												696,000
Environmental Health [Member] | Q4 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net					3,006,000
Environmental Health [Member] | Q4 2013 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Change in estimates										1,100,000
Restructuring and contract termination charges, net					0
Environmental Health [Member] | Q3 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net						0
Environmental Health [Member] | Q3 2013 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net						0
Environmental Health [Member] | Q2 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Change in estimates										(500,000)
Restructuring and contract termination charges, net							8,737,000
Environmental Health [Member] | Q2 2013 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Change in estimates										92,000
Restructuring and contract termination charges, net							50,000
Environmental Health [Member] | Q1 2013 Restructuring Plan [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net									245,000
Environmental Health [Member] | Q1 2013 Restructuring Plan [Member] | Closure Of Excess Facility Space [Member]
Restructuring Reserve [Roll Forward]
Restructuring and contract termination charges, net									0
Environmental Health [Member] | Previous restructuring and integration plans [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Change in estimates										$ (1,100,000)

[1] During fiscal year 2014, the Company recorded a pre-tax restructuring reversal of $0.1 million in the Environmental Health segment related to lower than expected costs associated with the remaining severance payments for the Q4 2013 Plan and recorded an additional pre-tax restructuring charge of $1.1 million in the Human Health segment related to higher than expected costs associated with the closure of the excess facility for the Q4 2013 Plan.

[2] During fiscal year 2014, the Company recorded pre-tax restructuring reversals of $0.3 million in the Human Health segment and $0.5 million in the Environmental Health segment related to lower than expected costs associated with the remaining severance payments for the Q2 2013 Plan. In addition during fiscal year 2014, the Company incurred an additional pre-tax restructuring charge of $0.1 million in each of the Human Health and Environmental Health segments related to higher than expected costs associated with the closure of the excess facility space for the Q2 2013 Plan.

[3] During fiscal year 2014, the Company recorded a pre-tax restructuring reversal of $0.2 million in the Human Health segment related to lower than expected costs associated with the remaining severance payments for the Q1 2013 Plan.

[4] During fiscal year 2014, the Company recognized pre-tax restructuring reversals of $1.6 million in the Human Health segment and $1.1 million in the Environmental Health segment related to lower than expected costs associated with workforce reductions for the previous restructuring plans. During fiscal year 2014, the Company recognized an additional pre-tax restructuring charge of $0.1 million in the Human Health segment related to higher than expected costs associated with the closure of the excess facility space for the previous restructuring plans.

[5] Subsequent to the initial charge, during fiscal year 2013, the Company recorded an additional $0.6 million pre-tax restructuring charge in the Human Health segment for the Q2 2013 Plan for services that were provided for one-time termination benefits in which the employee was required to render service beyond the legal notification period.