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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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