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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 29, 2024 | Mar. 31, 2023
Revenue |  |
Revenue | $ 122,489 | $ 102,603
Domestic |  |
Revenue |  |
Revenue | 122,489 | 102,603
Energy |  |
Revenue |  |
Revenue | 100,746 | 83,285
Energy | Domestic |  |
Revenue |  |
Revenue | 100,746 | 83,285
Engineering and Consulting |  |
Revenue |  |
Revenue | 21,743 | 19,318
Engineering and Consulting | Domestic |  |
Revenue |  |
Revenue | 21,743 | 19,318
Commercial |  |
Revenue |  |
Revenue | 8,783 | 7,883
Commercial | Energy |  |
Revenue |  |
Revenue | 7,203 | 6,719
Commercial | Engineering and Consulting |  |
Revenue |  |
Revenue | 1,580 | 1,164
Government |  |
Revenue |  |
Revenue | 55,918 | 44,170
Government | Energy |  |
Revenue |  |
Revenue | 35,820 | 26,075
Government | Engineering and Consulting |  |
Revenue |  |
Revenue | 20,098 | 18,095
Utilities |  |
Revenue |  |
Revenue | 57,788 | 50,550
Utilities | Energy |  |
Revenue |  |
Revenue | 57,723 | 50,491
Utilities | Engineering and Consulting |  |
Revenue |  |
Revenue | 65 | 59
Time-and-Materials Contract |  |
Revenue |  |
Revenue | 24,936 | 22,263
Time-and-Materials Contract | Energy |  |
Revenue |  |
Revenue | 8,537 | 7,709
Time-and-Materials Contract | Engineering and Consulting |  |
Revenue |  |
Revenue | 16,399 | 14,554
Unit-based Contract |  |
Revenue |  |
Revenue | 51,468 | 48,543
Unit-based Contract | Energy |  |
Revenue |  |
Revenue | 46,957 | 44,927
Unit-based Contract | Engineering and Consulting |  |
Revenue |  |
Revenue | 4,511 | 3,616
Fixed-Price Contract |  |
Revenue |  |
Revenue | 46,085 | 31,797
Fixed-Price Contract | Energy |  |
Revenue |  |
Revenue | 45,252 | 30,649
Fixed-Price Contract | Engineering and Consulting |  |
Revenue |  |
Revenue | $ 833 | $ 1,148

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