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SEGMENT AND GEOGRAPHICAL INFORMATION - Segment Assets (Details) - USD ($)
$ in Thousands
Dec. 30, 2022
Dec. 31, 2021
Jan. 01, 2021
Segment Reporting      
Segment assets $ 409,674 $ 394,422 $ 403,024
Operating Segments | Energy      
Segment Reporting      
Segment assets 342,067 363,232 337,739
Operating Segments | Engineering and Consulting      
Segment Reporting      
Segment assets 22,034 21,423 21,796
Corporate, Non-Segment      
Segment Reporting      
Segment assets 68,703 32,897 66,619
Intersegment Eliminations      
Segment Reporting      
Segment assets $ (23,130) $ (23,130) $ (23,130)