Restructuring and Lease Charges, Net (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended					9 Months Ended					3 Months Ended				9 Months Ended	3 Months Ended			9 Months Ended		3 Months Ended		9 Months Ended	3 Months Ended	9 Months Ended			9 Months Ended		12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended		12 Months Ended		12 Months Ended		9 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012	Dec. 30, 2012	Sep. 29, 2013 Q3 2013 Restructuring Plan [Member]	Sep. 29, 2013 Q3 2013 Restructuring Plan [Member] Human Health [Member]	Sep. 29, 2013 Q3 2013 Restructuring Plan [Member] Severance [Member]	Sep. 29, 2013 Q3 2013 Restructuring Plan [Member] Facility Closing [Member]	Jun. 30, 2013 Q2 2013 Restructuring Plan [Member]	Sep. 29, 2013 Q2 2013 Restructuring Plan [Member]	Sep. 29, 2013 Q2 2013 Restructuring Plan [Member] Human Health [Member]	Sep. 29, 2013 Q2 2013 Restructuring Plan [Member] Environmental Health [Member]	Sep. 29, 2013 Q2 2013 Restructuring Plan [Member] Severance [Member]	Sep. 29, 2013 Q2 2013 Restructuring Plan [Member] Facility Closing [Member]	Mar. 31, 2013 Q1 2013 Restructuring Plan [Member]	Mar. 31, 2013 Q1 2013 Restructuring Plan [Member] Human Health [Member]	Mar. 31, 2013 Q1 2013 Restructuring Plan [Member] Environmental Health [Member]	Mar. 31, 2013 Q1 2013 Restructuring Plan [Member] Severance [Member]	Sep. 29, 2013 Q1 2013 Restructuring Plan [Member] Severance [Member]	Dec. 30, 2012 Q4 2012 Restructuring Plan [Member]	Dec. 30, 2012 Q4 2012 Restructuring Plan [Member] Human Health [Member]	Dec. 30, 2012 Q4 2012 Restructuring Plan [Member] Environmental Health [Member]	Sep. 29, 2013 Q4 2012 Restructuring Plan [Member] Severance [Member]	Dec. 30, 2012 Q4 2012 Restructuring Plan [Member] Severance [Member]	Sep. 30, 2012 Q3 2012 Restructuring Plan [Member]	Sep. 30, 2012 Q3 2012 Restructuring Plan [Member] Human Health [Member]	Sep. 29, 2013 Q3 2012 Restructuring Plan [Member] Human Health [Member]	Sep. 30, 2012 Q3 2012 Restructuring Plan [Member] Environmental Health [Member]	Sep. 29, 2013 Q3 2012 Restructuring Plan [Member] Environmental Health [Member]	Sep. 29, 2013 Q3 2012 Restructuring Plan [Member] Severance [Member]	Dec. 30, 2012 Q3 2012 Restructuring Plan [Member] Severance [Member]	Sep. 29, 2013 Q2 2012 Restructuring Plan [Member]	Sep. 29, 2013 Q2 2012 Restructuring Plan [Member] Human Health [Member]	Dec. 30, 2012 Q2 2012 Restructuring Plan [Member] Human Health [Member]	Sep. 29, 2013 Q2 2012 Restructuring Plan [Member] Environmental Health [Member]	Dec. 30, 2012 Q2 2012 Restructuring Plan [Member] Environmental Health [Member]	Sep. 29, 2013 Q2 2012 Restructuring Plan [Member] Severance [Member]	Dec. 30, 2012 Q2 2012 Restructuring Plan [Member] Severance [Member]	Dec. 30, 2012 Q1 2012 Restructuring Plan [Member]	Sep. 29, 2013 Q1 2012 Restructuring Plan [Member]	Dec. 30, 2012 Q1 2012 Restructuring Plan [Member] Human Health [Member]	Dec. 30, 2012 Q1 2012 Restructuring Plan [Member] Environmental Health [Member]	Sep. 29, 2013 Q1 2012 Restructuring Plan [Member] Severance [Member]	Dec. 30, 2012 Q1 2012 Restructuring Plan [Member] Severance [Member]	Sep. 29, 2013 Previous restructuring and integration plans [Member]	Sep. 29, 2013 Previous restructuring and integration plans [Member] Severance [Member]	Sep. 29, 2013 Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and lease charges, net	$ 1,126,000	$ 9,672,000	$ 23,713,000	$ 21,034,000		$ 532,000	$ 500,000	$ 394,000	$ 138,000		$ 19,048,000	$ 10,300,000	$ 8,800,000	$ 18,476,000	$ 572,000		$ 2,300,000	$ 200,000	$ 2,585,000			$ 600,000	$ 2,400,000				$ 3,900,000		$ 3,900,000					$ 2,100,000	$ 7,200,000		$ 200,000	$ 2,052,000				$ 5,400,000	$ 1,000,000
Restructuring and Related Cost, Remaining Cost											300,000																						200,000								0
Restructuring Reserve, Accrual Adjustment																												(300,000)		(300,000)	(546,000)					(100,000)								30,000			(300,000)	300,000
Number of employees reduced						30				265						62					54					66							203							112
Remaining payments	27,739,000		27,739,000		21,364,000	506,000		394,000	112,000		14,705,000			14,652,000	53,000					214,000				666,000	2,682,000						4,148,000	7,553,000						2,663,000	4,586,000					717,000	1,281,000	8,900,000		100,000
Restructuring Reserve, Settled with Cash																																																900,000
Payments for Restructuring						$ 26,000		$ 0	$ 26,000		$ 4,343,000			$ 3,824,000	$ 519,000					$ 2,371,000				$ 2,016,000							$ 2,859,000							$ 3,975,000						$ 594,000		$ 1,900,000