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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2022 | Sep. 30, 2022 | Jul. 01, 2022 | Apr. 01, 2022 | Dec. 31, 2021 | Oct. 01, 2021 | Jul. 02, 2021 | Apr. 02, 2021 | Dec. 30, 2022 | Dec. 31, 2021 | Jan. 01, 2021
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 113,256 | $ 121,399 | $ 102,645 | $ 91,838 | $ 92,218 | $ 98,297 | $ 84,154 | $ 79,086 | $ 429,138 | $ 353,755 | $ 390,980
Domestic |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 429,138 | 353,755 | 390,980
Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 357,460 | 286,384 | 324,178
Energy | Domestic |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 357,460 | 286,384 | 324,178
Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 71,678 | 67,371 | 66,802
Engineering and Consulting | Domestic |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 71,678 | 67,371 | 66,802
Commercial |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 35,348 | 29,864 | 41,367
Commercial | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 29,782 | 24,541 | 36,212
Commercial | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,566 | 5,323 | 5,155
Government |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 192,463 | 127,148 | 155,233
Government | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 126,494 | 65,249 | 93,821
Government | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 65,969 | 61,899 | 61,412
Utilities |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 201,327 | 196,743 | 194,380
Utilities | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 201,184 | 196,594 | 194,145
Utilities | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 143 | 149 | 235
Time-and-Materials Contract |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 86,075 | 86,213 | 101,752
Time-and-Materials Contract | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 32,491 | 34,004 | 47,912
Time-and-Materials Contract | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 53,584 | 52,209 | 53,840
Unit-based Contract |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 194,805 | 190,999 | 180,186
Unit-based Contract | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 180,509 | 180,311 | 170,991
Unit-based Contract | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 14,296 | 10,688 | 9,195
Fixed-Price Contract |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 148,258 | 76,543 | 109,042
Fixed-Price Contract | Energy |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 144,460 | 72,069 | 105,275
Fixed-Price Contract | Engineering and Consulting |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 3,798 | $ 4,474 | $ 3,767

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