Restructuring and Lease Charges, Net (Schedule of Restructuring Plan Activity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended					3 Months Ended	6 Months Ended							3 Months Ended			6 Months Ended	12 Months Ended		6 Months Ended	3 Months Ended			12 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013 Q2 2013 Restructuring Plan [Member]	Jun. 30, 2013 Q2 2013 Restructuring Plan [Member] Severance [Member]	Jun. 30, 2013 Q2 2013 Restructuring Plan [Member] Facility Closing [Member]	Mar. 31, 2013 Q1 2013 Restructuring Plan [Member] Severance [Member]	Jun. 30, 2013 Q1 2013 Restructuring Plan [Member] Severance [Member]	Jun. 30, 2013 Q4 2012 Restructuring Plan [Member] Severance [Member]	Jun. 30, 2013 Q3 2012 Restructuring Plan [Member] Severance [Member]	Jun. 30, 2013 Q2 2012 Restructuring Plan [Member] Severance [Member]	Jun. 30, 2013 Q1 2012 Restructuring Plan [Member] Severance [Member]	Jun. 30, 2013 Previous restructuring and integration plans [Member]	Jun. 30, 2013 Human Health [Member] Q2 2013 Restructuring Plan [Member]	Mar. 31, 2013 Human Health [Member] Q1 2013 Restructuring Plan [Member]	Dec. 30, 2012 Human Health [Member] Q4 2012 Restructuring Plan [Member]	Sep. 30, 2012 Human Health [Member] Q3 2012 Restructuring Plan [Member]	Jun. 30, 2013 Human Health [Member] Q2 2012 Restructuring Plan [Member]	Dec. 30, 2012 Human Health [Member] Q2 2012 Restructuring Plan [Member]	Dec. 30, 2012 Human Health [Member] Q1 2012 Restructuring Plan [Member]	Jun. 30, 2013 Environmental Health [Member] Q2 2013 Restructuring Plan [Member]	Mar. 31, 2013 Environmental Health [Member] Q1 2013 Restructuring Plan [Member]	Dec. 30, 2012 Environmental Health [Member] Q4 2012 Restructuring Plan [Member]	Sep. 30, 2012 Environmental Health [Member] Q3 2012 Restructuring Plan [Member]	Dec. 30, 2012 Environmental Health [Member] Q2 2012 Restructuring Plan [Member]	Dec. 30, 2012 Environmental Health [Member] Q1 2012 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and lease charges, net	$ 19,277	$ 5,203	$ 22,587	$ 11,362	$ 18,735	$ 18,163	$ 572	$ 2,585				$ 1,805			$ 9,900	$ 2,300	$ 600	$ 3,900	$ 1,900	$ 7,200	$ 5,400	$ 8,800	$ 200	$ 2,400	$ 3,900	$ 200	$ 1,000
Restructuring Reserve [Roll Forward]
Balance at beginning of period			21,364							2,682	7,553	4,586	1,281
Amounts paid and foreign currency translation					(784)	(395)	(389)		(1,841)	(1,670)	(2,466)	(3,366)	(513)	(1,400)
Balance at end of period	$ 32,641		$ 32,641		$ 17,951	$ 17,768	$ 183		$ 744	$ 1,012	$ 4,641	$ 3,025	$ 798	$ 9,300