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SEGMENT AND GEOGRAPHICAL INFORMATION - Segment Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 30, 2022	Jul. 01, 2022
Segment Reporting
Segment assets	$ 394,820	$ 409,674	$ 381,883
Operating Segments | Energy
Segment Reporting
Segment assets	333,136		323,070
Operating Segments | Engineering and Consulting
Segment Reporting
Segment assets	23,851		23,293
Corporate, Non-Segment
Segment Reporting
Segment assets	60,963		58,650
Intersegment Eliminations
Segment Reporting
Segment assets	$ (23,130)		$ (23,130)

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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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