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Breakdown of Goodwill Reported by Segment (Detail) - USD ($)
$ in Thousands
Jul. 03, 2015
Jan. 02, 2015
Goodwill [Line Items]    
Goodwill $ 8,607 $ 8,607
Environmental and Health    
Goodwill [Line Items]    
Goodwill 8,099  
Engineering and Other Scientific    
Goodwill [Line Items]    
Goodwill $ 508