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Restructuring and Lease Charges, Net (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Jul. 01, 2012
Dec. 30, 2012
Jun. 30, 2013
Q2 2013 Restructuring Plan [Member]
Jun. 30, 2013
Q2 2013 Restructuring Plan [Member]
Human Health [Member]
Jun. 30, 2013
Q2 2013 Restructuring Plan [Member]
Environmental Health [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]
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]
Jun. 30, 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]
Jun. 30, 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]
employees
Sep. 30, 2012
Q3 2012 Restructuring Plan [Member]
Human Health [Member]
Jun. 30, 2013
Q3 2012 Restructuring Plan [Member]
Human Health [Member]
Sep. 30, 2012
Q3 2012 Restructuring Plan [Member]
Environmental Health [Member]
Jun. 30, 2013
Q3 2012 Restructuring Plan [Member]
Environmental Health [Member]
Jun. 30, 2013
Q3 2012 Restructuring Plan [Member]
Severance [Member]
Dec. 30, 2012
Q3 2012 Restructuring Plan [Member]
Severance [Member]
Jun. 30, 2013
Q2 2012 Restructuring Plan [Member]
employees
Jun. 30, 2013
Q2 2012 Restructuring Plan [Member]
Human Health [Member]
Dec. 30, 2012
Q2 2012 Restructuring Plan [Member]
Human Health [Member]
Jun. 30, 2013
Q2 2012 Restructuring Plan [Member]
Environmental Health [Member]
Dec. 30, 2012
Q2 2012 Restructuring Plan [Member]
Environmental Health [Member]
Jun. 30, 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]
employees
Jun. 30, 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]
Jun. 30, 2013
Q1 2012 Restructuring Plan [Member]
Severance [Member]
Dec. 30, 2012
Q1 2012 Restructuring Plan [Member]
Severance [Member]
Jun. 30, 2013
Previous restructuring and integration plans [Member]
Jun. 30, 2013
Previous restructuring and integration plans [Member]
Severance [Member]
Jun. 30, 2013
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]                                                                                      
Restructuring and lease charges, net $ 19,277,000 $ 5,203,000 $ 22,587,000 $ 11,362,000   $ 18,735,000 $ 9,900,000 $ 8,800,000 $ 18,163,000 $ 572,000   $ 2,300,000 $ 200,000 $ 2,585,000     $ 600,000 $ 2,400,000       $ 3,900,000   $ 3,900,000         $ 1,900,000 $ 7,200,000   $ 200,000 $ 1,805,000       $ 5,400,000 $ 1,000,000          
Restructuring and Related Cost, Remaining Cost           600,000                                           400,000               0              
Additional accrual for estimated sublease rental payments and (reversal) related to lower than expected cost associated with workforce reductions                                             (200,000)   (200,000) (446,000)         (100,000)               30,000     (300,000) 200,000
Number of employees reduced           265         62         54         66             203             112                
Remaining payments 32,641,000   32,641,000   21,364,000 17,951,000     17,768,000 183,000         744,000       1,012,000 2,682,000           4,641,000 7,553,000           3,025,000 4,586,000         798,000 1,281,000 9,300,000   100,000
Restructuring Reserve, Settled with Cash                                                                                     700,000
Payments for Restructuring           $ 784,000     $ 395,000 $ 389,000         $ 1,841,000       $ 1,670,000             $ 2,466,000             $ 3,366,000           $ 513,000   $ 1,400,000