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SEGMENT AND GEOGRAPHICAL INFORMATION - Segment Assets (Details) - USD ($) $ in Thousands | Sep. 29, 2023 | Dec. 30, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Segment Reporting |  |  |
Segment assets | $ 401,620 | $ 409,674 | $ 395,111
Operating Segments | Energy |  |  |
Segment Reporting |  |  |
Segment assets | 340,422 |  | 336,036
Operating Segments | Engineering and Consulting |  |  |
Segment Reporting |  |  |
Segment assets | 26,901 |  | 22,630
Corporate, Non-Segment |  |  |
Segment Reporting |  |  |
Segment assets | 57,427 |  | 59,575
Intersegment Eliminations |  |  |
Segment Reporting |  |  |
Segment assets | $ (23,130) |  | $ (23,130)

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