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SEGMENT AND GEOGRAPHICAL INFORMATION - Segment Assets (Details) - USD ($) $ in Thousands	Dec. 29, 2023	Dec. 30, 2022	Dec. 31, 2021
Segment Reporting
Segment assets	$ 415,588	$ 409,674	$ 394,422
Operating Segments | Energy
Segment Reporting
Segment assets	345,745	342,067	363,232
Operating Segments | Engineering and Consulting
Segment Reporting
Segment assets	25,842	22,034	21,423
Corporate, Non-Segment
Segment Reporting
Segment assets	67,131	68,703	32,897
Intersegment Eliminations
Segment Reporting
Segment assets	$ (23,130)	$ (23,130)	$ (23,130)

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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