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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2023 | Sep. 29, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 30, 2022 | Sep. 30, 2022 | Jul. 01, 2022 | Apr. 01, 2022 | Dec. 29, 2023 | Dec. 30, 2022 | Dec. 31, 2021
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 155,677 | $ 132,738 | $ 119,077 | $ 102,603 | $ 113,256 | $ 121,399 | $ 102,645 | $ 91,838 | $ 510,095 | $ 429,138 | $ 353,755
Domestic |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 510,095 | 429,138 | 353,755
Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 426,976 | 357,460 | 286,384
Energy | Domestic |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 426,976 | 357,460 | 286,384
Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 83,119 | 71,678 | 67,371
Engineering and Consulting | Domestic |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 83,119 | 71,678 | 67,371
Commercial |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 37,028 | 35,348 | 29,864
Commercial | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 31,162 | 29,782 | 24,541
Commercial | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,866 | 5,566 | 5,323
Government |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 236,907 | 192,463 | 127,148
Government | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 159,935 | 126,494 | 65,249
Government | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 76,972 | 65,969 | 61,899
Utilities |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 236,160 | 201,327 | 196,743
Utilities | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 235,879 | 201,184 | 196,594
Utilities | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 281 | 143 | 149
Time-and-Materials Contract |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 99,112 | 86,075 | 86,213
Time-and-Materials Contract | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 35,582 | 32,491 | 34,004
Time-and-Materials Contract | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 63,530 | 53,584 | 52,209
Unit-based Contract |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 214,793 | 194,805 | 190,999
Unit-based Contract | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 199,040 | 180,509 | 180,311
Unit-based Contract | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 15,753 | 14,296 | 10,688
Fixed-Price Contract |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 196,190 | 148,258 | 76,543
Fixed-Price Contract | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 192,354 | 144,460 | 72,069
Fixed-Price Contract | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 3,836 | $ 3,798 | $ 4,474

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