Restructuring and Lease Charges, Net (Schedule of Restructuring Plan Activity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013	Mar. 30, 2014 Q1 2014 Restructuring Plan [Member] Severance [Member]	Mar. 30, 2014 Q4 2013 Restructuring Plan [Member]	Mar. 30, 2014 Q4 2013 Restructuring Plan [Member] Severance [Member]	Mar. 30, 2014 Q4 2013 Restructuring Plan [Member] Facility Closing [Member]	Mar. 30, 2014 Q3 2013 Restructuring Plan [Member] Severance [Member]	Mar. 30, 2014 Q2 2013 Restructuring Plan [Member]	Mar. 30, 2014 Q2 2013 Restructuring Plan [Member] Severance [Member]	Mar. 30, 2014 Q2 2013 Restructuring Plan [Member] Facility Closing [Member]	Mar. 30, 2014 Q1 2013 Restructuring Plan [Member] Severance [Member]	Mar. 30, 2014 Previous restructuring and integration plans [Member]	Mar. 30, 2014 Human Health [Member] Q1 2014 Restructuring Plan [Member]	Dec. 29, 2013 Human Health [Member] Q4 2013 Restructuring Plan [Member]	Sep. 29, 2013 Human Health [Member] Q3 2013 Restructuring Plan [Member]	Jun. 30, 2013 Human Health [Member] Q2 2013 Restructuring Plan [Member]	Dec. 29, 2013 Human Health [Member] Q2 2013 Restructuring Plan [Member]	Mar. 30, 2014 Human Health [Member] Q2 2013 Restructuring Plan [Member] Facility Closing [Member]	Mar. 31, 2013 Human Health [Member] Q1 2013 Restructuring Plan [Member]	Mar. 30, 2014 Environmental Health [Member] Q1 2014 Restructuring Plan [Member]	Dec. 29, 2013 Environmental Health [Member] Q4 2013 Restructuring Plan [Member]	Jun. 30, 2013 Environmental Health [Member] Q2 2013 Restructuring Plan [Member]	Mar. 30, 2014 Environmental Health [Member] Q2 2013 Restructuring Plan [Member] Facility Closing [Member]	Mar. 31, 2013 Environmental Health [Member] Q1 2013 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and lease charges, net	$ 2,135	$ 3,310	$ 567										$ 400	$ 8,200	$ 500	$ 9,900	$ 600		$ 2,300	$ 200	$ 3,000	$ 8,800		$ 200
Restructuring Reserve [Roll Forward]
Balance at beginning of period	26,374			8,842	1,988	6,854	137	12,750	12,750	0	208
Restructuring Reserve, Accrual Adjustment								(184)	0	(184)								(100)					(100)
Amounts paid and foreign currency translation			(120)	(1,244)	(995)	(249)	(113)	(4,019)	(3,981)	(38)	0	(3,000)
Balance at end of period	$ 19,410		$ 447	$ 7,598	$ 993	$ 6,605	$ 24	$ 8,915	$ 8,769	$ 146	$ 208	$ 10,300