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SEGMENT AND GEOGRAPHICAL INFORMATION - Segment Assets (Details) - USD ($) $ in Thousands	Dec. 27, 2024	Dec. 29, 2023	Dec. 30, 2022
Segment Reporting
Segment assets	$ 464,863	$ 415,588	$ 409,674
Operating Segments | Energy
Segment Reporting
Segment assets	348,883	345,745	342,067
Operating Segments | Engineering and Consulting
Segment Reporting
Segment assets	29,202	25,842	22,034
Corporate, Non-Segment
Segment Reporting
Segment assets	109,908	67,131	68,703
Intersegment Eliminations
Segment Reporting
Segment assets	$ (23,130)	$ (23,130)	$ (23,130)

X

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Amount of asset recognized for present right to economic benefit.

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