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Goodwill and Intangible Assets, Net (Changes in the Carrying Amount of Goodwill) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 03, 2016
Dec. 28, 2014
Changes in the carrying amount of goodwill    
Foreign currency translation $ (55,434) $ (37,886)
Acquisitions, earn outs and other 47,506 178,843
Ending balance 2,276,149 2,284,077
Human Health [Member]    
Changes in the carrying amount of goodwill    
Foreign currency translation (28,368) (29,145)
Acquisitions, earn outs and other 38,104 2,408
Ending balance 1,672,491 1,662,755
Environmental Health [Member]    
Changes in the carrying amount of goodwill    
Foreign currency translation (27,066) (8,741)
Acquisitions, earn outs and other 9,402 176,435
Ending balance $ 603,658 $ 621,322