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SEGMENT AND GEOGRAPHICAL INFORMATION - Segment Assets (Details) - USD ($) $ in Thousands	Apr. 04, 2025	Dec. 27, 2024	Mar. 29, 2024
Segment Reporting
Segment assets	$ 471,158	$ 464,863	$ 407,900
Operating Segments | Energy
Segment Reporting
Segment assets	372,792		318,808
Operating Segments | Engineering and Consulting
Segment Reporting
Segment assets	41,633		26,613
Corporate, Non-Segment
Segment Reporting
Segment assets	79,863		85,609
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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