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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Revenue
Revenue	$ 158,252	$ 132,738	$ 421,737	$ 354,418
Domestic
Revenue
Revenue	158,252	132,738	421,737	354,418
Energy
Revenue
Revenue	134,036	111,030	352,634	292,330
Energy | Domestic
Revenue
Revenue	134,036	111,030	352,634	292,330
Engineering and Consulting
Revenue
Revenue	24,216	21,708	69,103	62,088
Engineering and Consulting | Domestic
Revenue
Revenue	24,216	21,708	69,103	62,088
Commercial
Revenue
Revenue	9,932	9,036	29,139	25,735
Commercial | Energy
Revenue
Revenue	7,964	7,448	23,858	21,607
Commercial | Engineering and Consulting
Revenue
Revenue	1,968	1,588	5,281	4,128
Government
Revenue
Revenue	83,270	72,464	212,017	176,787
Government | Energy
Revenue
Revenue	61,115	52,410	148,403	119,028
Government | Engineering and Consulting
Revenue
Revenue	22,155	20,054	63,614	57,759
Utilities
Revenue
Revenue	65,050	51,238	180,581	151,896
Utilities | Energy
Revenue
Revenue	64,957	51,172	180,373	151,695
Utilities | Engineering and Consulting
Revenue
Revenue	93	66	208	201
Time-and-Materials Contract
Revenue
Revenue	25,720	26,011	76,383	73,664
Time-and-Materials Contract | Energy
Revenue
Revenue	7,953	9,382	25,190	26,038
Time-and-Materials Contract | Engineering and Consulting
Revenue
Revenue	17,767	16,629	51,193	47,626
Unit-based Contract
Revenue
Revenue	57,480	46,301	161,397	138,562
Unit-based Contract | Energy
Revenue
Revenue	52,487	42,119	147,022	126,946
Unit-based Contract | Engineering and Consulting
Revenue
Revenue	4,993	4,182	14,375	11,616
Fixed-Price Contract
Revenue
Revenue	75,052	60,426	183,957	142,192
Fixed-Price Contract | Energy
Revenue
Revenue	73,596	59,529	180,422	139,346
Fixed-Price Contract | Engineering and Consulting
Revenue
Revenue	$ 1,456	$ 897	$ 3,535	$ 2,846

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