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SEGMENT AND GEOGRAPHICAL INFORMATION - Segment Assets (Details) - USD ($) $ in Thousands	Jun. 28, 2024	Dec. 29, 2023	Jun. 30, 2023
Segment Reporting
Segment assets	$ 421,289	$ 415,588	$ 394,820
Operating Segments | Energy
Segment Reporting
Segment assets	328,031		333,136
Operating Segments | Engineering and Consulting
Segment Reporting
Segment assets	30,989		23,851
Corporate, Non-Segment
Segment Reporting
Segment assets	85,399		60,963
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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