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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 04, 2025 | Mar. 29, 2024
Revenue |  |
Revenue | $ 152,386 | $ 122,489
Domestic |  |
Revenue |  |
Revenue | 152,386 | 122,489
Energy |  |
Revenue |  |
Revenue | 126,248 | 100,746
Energy | Domestic |  |
Revenue |  |
Revenue | 126,248 | 100,746
Engineering and Consulting |  |
Revenue |  |
Revenue | 26,138 | 21,743
Engineering and Consulting | Domestic |  |
Revenue |  |
Revenue | 26,138 | 21,743
Commercial |  |
Revenue |  |
Revenue | 15,326 | 8,783
Commercial | Energy |  |
Revenue |  |
Revenue | 13,515 | 7,203
Commercial | Engineering and Consulting |  |
Revenue |  |
Revenue | 1,811 | 1,580
Government |  |
Revenue |  |
Revenue | 72,596 | 55,918
Government | Energy |  |
Revenue |  |
Revenue | 48,324 | 35,820
Government | Engineering and Consulting |  |
Revenue |  |
Revenue | 24,272 | 20,098
Utilities |  |
Revenue |  |
Revenue | 64,464 | 57,788
Utilities | Energy |  |
Revenue |  |
Revenue | 64,409 | 57,723
Utilities | Engineering and Consulting |  |
Revenue |  |
Revenue | 55 | 65
Time-and-materials |  |
Revenue |  |
Revenue | 29,662 | 24,936
Time-and-materials | Energy |  |
Revenue |  |
Revenue | 11,602 | 8,537
Time-and-materials | Engineering and Consulting |  |
Revenue |  |
Revenue | 18,060 | 16,399
Unit-based |  |
Revenue |  |
Revenue | 53,962 | 51,468
Unit-based | Energy |  |
Revenue |  |
Revenue | 47,707 | 46,957
Unit-based | Engineering and Consulting |  |
Revenue |  |
Revenue | 6,255 | 4,511
Fixed price |  |
Revenue |  |
Revenue | 68,762 | 46,085
Fixed price | Energy |  |
Revenue |  |
Revenue | 66,939 | 45,252
Fixed price | Engineering and Consulting |  |
Revenue |  |
Revenue | $ 1,823 | $ 833

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