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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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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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