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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2024	Jun. 30, 2023	Jun. 28, 2024	Jun. 30, 2023
Revenue
Revenue	$ 140,996	$ 119,077	$ 263,485	$ 221,680
Domestic
Revenue
Revenue	140,996	119,077	263,485	221,680
Energy
Revenue
Revenue	117,852	98,015	218,598	181,300
Energy | Domestic
Revenue
Revenue	117,852	98,015	218,598	181,300
Engineering and Consulting
Revenue
Revenue	23,144	21,062	44,887	40,380
Engineering and Consulting | Domestic
Revenue
Revenue	23,144	21,062	44,887	40,380
Commercial
Revenue
Revenue	10,424	8,816	19,207	16,699
Commercial | Energy
Revenue
Revenue	8,691	7,440	15,894	14,159
Commercial | Engineering and Consulting
Revenue
Revenue	1,733	1,376	3,313	2,540
Government
Revenue
Revenue	72,829	60,153	128,747	104,323
Government | Energy
Revenue
Revenue	51,468	40,543	87,288	66,618
Government | Engineering and Consulting
Revenue
Revenue	21,361	19,610	41,459	37,705
Utilities
Revenue
Revenue	57,743	50,108	115,531	100,658
Utilities | Energy
Revenue
Revenue	57,693	50,032	115,416	100,523
Utilities | Engineering and Consulting
Revenue
Revenue	50	76	115	135
Time-and-Materials Contract
Revenue
Revenue	25,727	25,390	50,663	47,653
Time-and-Materials Contract | Energy
Revenue
Revenue	8,700	8,947	17,237	16,656
Time-and-Materials Contract | Engineering and Consulting
Revenue
Revenue	17,027	16,443	33,426	30,997
Unit-based Contract
Revenue
Revenue	52,449	43,718	103,917	92,261
Unit-based Contract | Energy
Revenue
Revenue	47,578	39,900	94,535	84,827
Unit-based Contract | Engineering and Consulting
Revenue
Revenue	4,871	3,818	9,382	7,434
Fixed-Price Contract
Revenue
Revenue	62,820	49,969	108,905	81,766
Fixed-Price Contract | Energy
Revenue
Revenue	61,574	49,168	106,826	79,817
Fixed-Price Contract | Engineering and Consulting
Revenue
Revenue	$ 1,246	$ 801	$ 2,079	$ 1,949

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