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Goodwill (Tables)
12 Months Ended
Dec. 28, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Breakdown of Goodwill Reported by Segment

Below is a breakdown of goodwill, reported by segment as of December 28, 2012 and December 30, 2011:

 

    Environmental   Engineering and      
(In thousands)   and health   other scientific   Total  
                     
Goodwill   $ 8,099   $ 508   $ 8,607