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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 04, 2025	Mar. 29, 2024
Revenue
Revenue	$ 152,386	$ 122,489
Domestic
Revenue
Revenue	152,386	122,489
Energy
Revenue
Revenue	126,248	100,746
Energy | Domestic
Revenue
Revenue	126,248	100,746
Engineering and Consulting
Revenue
Revenue	26,138	21,743
Engineering and Consulting | Domestic
Revenue
Revenue	26,138	21,743
Commercial
Revenue
Revenue	15,326	8,783
Commercial | Energy
Revenue
Revenue	13,515	7,203
Commercial | Engineering and Consulting
Revenue
Revenue	1,811	1,580
Government
Revenue
Revenue	72,596	55,918
Government | Energy
Revenue
Revenue	48,324	35,820
Government | Engineering and Consulting
Revenue
Revenue	24,272	20,098
Utilities
Revenue
Revenue	64,464	57,788
Utilities | Energy
Revenue
Revenue	64,409	57,723
Utilities | Engineering and Consulting
Revenue
Revenue	55	65
Time-and-materials
Revenue
Revenue	29,662	24,936
Time-and-materials | Energy
Revenue
Revenue	11,602	8,537
Time-and-materials | Engineering and Consulting
Revenue
Revenue	18,060	16,399
Unit-based
Revenue
Revenue	53,962	51,468
Unit-based | Energy
Revenue
Revenue	47,707	46,957
Unit-based | Engineering and Consulting
Revenue
Revenue	6,255	4,511
Fixed price
Revenue
Revenue	68,762	46,085
Fixed price | Energy
Revenue
Revenue	66,939	45,252
Fixed price | Engineering and Consulting
Revenue
Revenue	$ 1,823	$ 833

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