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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2024	Mar. 31, 2023
Revenue
Revenue	$ 122,489	$ 102,603
Domestic
Revenue
Revenue	122,489	102,603
Energy
Revenue
Revenue	100,746	83,285
Energy | Domestic
Revenue
Revenue	100,746	83,285
Engineering and Consulting
Revenue
Revenue	21,743	19,318
Engineering and Consulting | Domestic
Revenue
Revenue	21,743	19,318
Commercial
Revenue
Revenue	8,783	7,883
Commercial | Energy
Revenue
Revenue	7,203	6,719
Commercial | Engineering and Consulting
Revenue
Revenue	1,580	1,164
Government
Revenue
Revenue	55,918	44,170
Government | Energy
Revenue
Revenue	35,820	26,075
Government | Engineering and Consulting
Revenue
Revenue	20,098	18,095
Utilities
Revenue
Revenue	57,788	50,550
Utilities | Energy
Revenue
Revenue	57,723	50,491
Utilities | Engineering and Consulting
Revenue
Revenue	65	59
Time-and-Materials Contract
Revenue
Revenue	24,936	22,263
Time-and-Materials Contract | Energy
Revenue
Revenue	8,537	7,709
Time-and-Materials Contract | Engineering and Consulting
Revenue
Revenue	16,399	14,554
Unit-based Contract
Revenue
Revenue	51,468	48,543
Unit-based Contract | Energy
Revenue
Revenue	46,957	44,927
Unit-based Contract | Engineering and Consulting
Revenue
Revenue	4,511	3,616
Fixed-Price Contract
Revenue
Revenue	46,085	31,797
Fixed-Price Contract | Energy
Revenue
Revenue	45,252	30,649
Fixed-Price Contract | Engineering and Consulting
Revenue
Revenue	$ 833	$ 1,148

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