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SEGMENT AND GEOGRAPHICAL INFORMATION - Segment Assets (Details) - USD ($) $ in Thousands	Sep. 27, 2024	Dec. 29, 2023	Sep. 29, 2023
Segment Reporting
Segment assets	$ 447,253	$ 415,588	$ 401,620
Operating Segments | Energy
Segment Reporting
Segment assets	348,617		340,422
Operating Segments | Engineering and Consulting
Segment Reporting
Segment assets	29,523		26,901
Corporate, Non-Segment
Segment Reporting
Segment assets	92,243		57,427
Intersegment Eliminations
Segment Reporting
Segment assets	$ (23,130)		$ (23,130)

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Amount of asset recognized for present right to economic benefit.

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