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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2023 | Sep. 30, 2022 | Sep. 29, 2023 | Sep. 30, 2022
Revenue |  |  |  |
Revenue | $ 132,738 | $ 121,399 | $ 354,418 | $ 315,882
Domestic |  |  |  |
Revenue |  |  |  |
Revenue | 132,738 | 121,399 | 354,418 | 315,882
Energy |  |  |  |
Revenue |  |  |  |
Revenue | 111,030 | 102,625 | 292,330 | 262,186
Energy | Domestic |  |  |  |
Revenue |  |  |  |
Revenue | 111,030 | 102,625 | 292,330 | 262,186
Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 21,708 | 18,774 | 62,088 | 53,696
Engineering and Consulting | Domestic |  |  |  |
Revenue |  |  |  |
Revenue | 21,708 | 18,774 | 62,088 | 53,696
Commercial |  |  |  |
Revenue |  |  |  |
Revenue | 9,036 | 8,224 | 25,735 | 25,968
Commercial | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 7,448 | 6,848 | 21,607 | 21,638
Commercial | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 1,588 | 1,376 | 4,128 | 4,330
Government |  |  |  |
Revenue |  |  |  |
Revenue | 72,464 | 65,421 | 176,787 | 145,432
Government | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 52,410 | 48,073 | 119,028 | 96,293
Government | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 20,054 | 17,348 | 57,759 | 49,139
Utilities |  |  |  |
Revenue |  |  |  |
Revenue | 51,238 | 47,754 | 151,896 | 144,482
Utilities | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 51,172 | 47,704 | 151,695 | 144,255
Utilities | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 66 | 50 | 201 | 227
Time-and-Materials Contract |  |  |  |
Revenue |  |  |  |
Revenue | 26,011 | 21,348 | 73,664 | 64,094
Time-and-Materials Contract | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 9,382 | 7,468 | 26,038 | 23,873
Time-and-Materials Contract | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 16,629 | 13,880 | 47,626 | 40,221
Unit-based Contract |  |  |  |
Revenue |  |  |  |
Revenue | 46,301 | 46,830 | 138,562 | 139,070
Unit-based Contract | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 42,119 | 43,039 | 126,946 | 128,540
Unit-based Contract | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | 4,182 | 3,791 | 11,616 | 10,530
Fixed-Price Contract |  |  |  |
Revenue |  |  |  |
Revenue | 60,426 | 53,221 | 142,192 | 112,718
Fixed-Price Contract | Energy |  |  |  |
Revenue |  |  |  |
Revenue | 59,529 | 52,118 | 139,346 | 109,773
Fixed-Price Contract | Engineering and Consulting |  |  |  |
Revenue |  |  |  |
Revenue | $ 897 | $ 1,103 | $ 2,846 | $ 2,945

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