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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Sep. 29, 2023	Sep. 30, 2022
Revenue
Revenue	$ 132,738	$ 121,399	$ 354,418	$ 315,882
Domestic
Revenue
Revenue	132,738	121,399	354,418	315,882
Energy
Revenue
Revenue	111,030	102,625	292,330	262,186
Energy | Domestic
Revenue
Revenue	111,030	102,625	292,330	262,186
Engineering and Consulting
Revenue
Revenue	21,708	18,774	62,088	53,696
Engineering and Consulting | Domestic
Revenue
Revenue	21,708	18,774	62,088	53,696
Commercial
Revenue
Revenue	9,036	8,224	25,735	25,968
Commercial | Energy
Revenue
Revenue	7,448	6,848	21,607	21,638
Commercial | Engineering and Consulting
Revenue
Revenue	1,588	1,376	4,128	4,330
Government
Revenue
Revenue	72,464	65,421	176,787	145,432
Government | Energy
Revenue
Revenue	52,410	48,073	119,028	96,293
Government | Engineering and Consulting
Revenue
Revenue	20,054	17,348	57,759	49,139
Utilities
Revenue
Revenue	51,238	47,754	151,896	144,482
Utilities | Energy
Revenue
Revenue	51,172	47,704	151,695	144,255
Utilities | Engineering and Consulting
Revenue
Revenue	66	50	201	227
Time-and-Materials Contract
Revenue
Revenue	26,011	21,348	73,664	64,094
Time-and-Materials Contract | Energy
Revenue
Revenue	9,382	7,468	26,038	23,873
Time-and-Materials Contract | Engineering and Consulting
Revenue
Revenue	16,629	13,880	47,626	40,221
Unit-based Contract
Revenue
Revenue	46,301	46,830	138,562	139,070
Unit-based Contract | Energy
Revenue
Revenue	42,119	43,039	126,946	128,540
Unit-based Contract | Engineering and Consulting
Revenue
Revenue	4,182	3,791	11,616	10,530
Fixed-Price Contract
Revenue
Revenue	60,426	53,221	142,192	112,718
Fixed-Price Contract | Energy
Revenue
Revenue	59,529	52,118	139,346	109,773
Fixed-Price Contract | Engineering and Consulting
Revenue
Revenue	$ 897	$ 1,103	$ 2,846	$ 2,945

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