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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2025	Jun. 28, 2024	Jul. 04, 2025	Jun. 28, 2024
Revenue
Revenue	$ 173,473	$ 140,996	$ 325,859	$ 263,485
United States
Revenue
Revenue	173,473	140,996	325,859	263,485
Commercial
Revenue
Revenue	19,848	10,424	35,174	19,207
Government
Revenue
Revenue	80,763	72,829	153,359	128,747
Utilities
Revenue
Revenue	72,862	57,743	137,326	115,531
Time-and-materials
Revenue
Revenue	30,632	25,727	60,294	50,663
Unit-based
Revenue
Revenue	64,737	52,449	118,699	103,917
Fixed price
Revenue
Revenue	78,104	62,820	146,866	108,905
Energy
Revenue
Revenue	146,749	117,852	272,997	218,598
Energy | United States
Revenue
Revenue	146,749	117,852	272,997	218,598
Energy | Commercial
Revenue
Revenue	18,093	8,691	31,608	15,894
Energy | Government
Revenue
Revenue	55,839	51,468	104,163	87,288
Energy | Utilities
Revenue
Revenue	72,817	57,693	137,226	115,416
Energy | Time-and-materials
Revenue
Revenue	11,733	8,700	23,335	17,237
Energy | Unit-based
Revenue
Revenue	58,250	47,578	105,957	94,535
Energy | Fixed price
Revenue
Revenue	76,766	61,574	143,705	106,826
Engineering and Consulting
Revenue
Revenue	26,724	23,144	52,862	44,887
Engineering and Consulting | United States
Revenue
Revenue	26,724	23,144	52,862	44,887
Engineering and Consulting | Commercial
Revenue
Revenue	1,755	1,733	3,566	3,313
Engineering and Consulting | Government
Revenue
Revenue	24,924	21,361	49,196	41,459
Engineering and Consulting | Utilities
Revenue
Revenue	45	50	100	115
Engineering and Consulting | Time-and-materials
Revenue
Revenue	18,899	17,027	36,959	33,426
Engineering and Consulting | Unit-based
Revenue
Revenue	6,487	4,871	12,742	9,382
Engineering and Consulting | Fixed price
Revenue
Revenue	$ 1,338	$ 1,246	$ 3,161	$ 2,079

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