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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2025	Sep. 27, 2024	Oct. 03, 2025	Sep. 27, 2024
Revenue
Revenue	$ 182,006	$ 158,252	$ 507,865	$ 421,737
United States
Revenue
Revenue	182,006	158,252	507,865	421,737
Commercial
Revenue
Revenue	17,887	9,932	53,061	29,139
Government
Revenue
Revenue	89,843	83,270	243,202	212,017
Utilities
Revenue
Revenue	74,276	65,050	211,602	180,581
Time-and-materials
Revenue
Revenue	31,248	25,720	91,542	76,383
Unit-based
Revenue
Revenue	65,217	57,480	183,916	161,397
Fixed price
Revenue
Revenue	85,541	75,052	232,407	183,957
Energy
Revenue
Revenue	154,750	134,036	427,747	352,634
Energy | United States
Revenue
Revenue	154,750	134,036	427,747	352,634
Energy | Commercial
Revenue
Revenue	15,942	7,964	47,550	23,858
Energy | Government
Revenue
Revenue	64,587	61,115	168,750	148,403
Energy | Utilities
Revenue
Revenue	74,221	64,957	211,447	180,373
Energy | Time-and-materials
Revenue
Revenue	12,866	7,953	36,201	25,190
Energy | Unit-based
Revenue
Revenue	58,252	52,487	164,209	147,022
Energy | Fixed price
Revenue
Revenue	83,632	73,596	227,337	180,422
Engineering and Consulting
Revenue
Revenue	27,256	24,216	80,118	69,103
Engineering and Consulting | United States
Revenue
Revenue	27,256	24,216	80,118	69,103
Engineering and Consulting | Commercial
Revenue
Revenue	1,945	1,968	5,511	5,281
Engineering and Consulting | Government
Revenue
Revenue	25,256	22,155	74,452	63,614
Engineering and Consulting | Utilities
Revenue
Revenue	55	93	155	208
Engineering and Consulting | Time-and-materials
Revenue
Revenue	18,382	17,767	55,341	51,193
Engineering and Consulting | Unit-based
Revenue
Revenue	6,965	4,993	19,707	14,375
Engineering and Consulting | Fixed price
Revenue
Revenue	$ 1,909	$ 1,456	$ 5,070	$ 3,535

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