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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2024 | Sep. 29, 2023 | Sep. 27, 2024 | Sep. 29, 2023
Revenue |  |  |  |
Revenue | $ 158,252 | $ 132,738 | $ 421,737 | $ 354,418
Domestic |  |  |  |
Revenue |  |  |  |
Revenue | 158,252 | 132,738 | 421,737 | 354,418
Energy |  |  |  |
Revenue |  |  |  |
Revenue | 134,036 | 111,030 | 352,634 | 292,330
Energy | Domestic |  |  |  |
Revenue |  |  |  |
Revenue | 134,036 | 111,030 | 352,634 | 292,330
Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 24,216 | 21,708 | 69,103 | 62,088
Engineering and Consulting | Domestic |  |  |  |
Revenue |  |  |  |
Revenue | 24,216 | 21,708 | 69,103 | 62,088
Commercial |  |  |  |
Revenue |  |  |  |
Revenue | 9,932 | 9,036 | 29,139 | 25,735
Commercial | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 7,964 | 7,448 | 23,858 | 21,607
Commercial | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 1,968 | 1,588 | 5,281 | 4,128
Government |  |  |  |
Revenue |  |  |  |
Revenue | 83,270 | 72,464 | 212,017 | 176,787
Government | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 61,115 | 52,410 | 148,403 | 119,028
Government | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 22,155 | 20,054 | 63,614 | 57,759
Utilities |  |  |  |
Revenue |  |  |  |
Revenue | 65,050 | 51,238 | 180,581 | 151,896
Utilities | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 64,957 | 51,172 | 180,373 | 151,695
Utilities | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 93 | 66 | 208 | 201
Time-and-Materials Contract |  |  |  |
Revenue |  |  |  |
Revenue | 25,720 | 26,011 | 76,383 | 73,664
Time-and-Materials Contract | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 7,953 | 9,382 | 25,190 | 26,038
Time-and-Materials Contract | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 17,767 | 16,629 | 51,193 | 47,626
Unit-based Contract |  |  |  |
Revenue |  |  |  |
Revenue | 57,480 | 46,301 | 161,397 | 138,562
Unit-based Contract | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 52,487 | 42,119 | 147,022 | 126,946
Unit-based Contract | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 4,993 | 4,182 | 14,375 | 11,616
Fixed-Price Contract |  |  |  |
Revenue |  |  |  |
Revenue | 75,052 | 60,426 | 183,957 | 142,192
Fixed-Price Contract | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 73,596 | 59,529 | 180,422 | 139,346
Fixed-Price Contract | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | $ 1,456 | $ 897 | $ 3,535 | $ 2,846

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