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Goodwill Reported By segment (Detail) - USD ($)
$ in Thousands
Jan. 01, 2021
Jan. 03, 2020
Goodwill Reported By Segment [Line Items]    
Goodwill $ 8,607 $ 8,607
Environmental and Health    
Goodwill Reported By Segment [Line Items]    
Goodwill 8,099 8,099
Engineering and Other Scientific    
Goodwill Reported By Segment [Line Items]    
Goodwill $ 508 $ 508