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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Apr. 01, 2022
Revenue |  |
Revenue | $ 102,603 | $ 91,838
Domestic |  |
Revenue |  |
Revenue | 102,603 | 91,838
Energy |  |
Revenue |  |
Revenue | 83,285 | 74,886
Energy | Domestic |  |
Revenue |  |
Revenue | 83,285 | 74,886
Engineering and Consulting |  |
Revenue |  |
Revenue | 19,318 | 16,952
Engineering and Consulting | Domestic |  |
Revenue |  |
Revenue | 19,318 | 16,952
Commercial |  |
Revenue |  |
Revenue | 7,883 | 9,567
Commercial | Energy |  |
Revenue |  |
Revenue | 6,719 | 8,089
Commercial | Engineering and Consulting |  |
Revenue |  |
Revenue | 1,164 | 1,478
Government |  |
Revenue |  |
Revenue | 44,170 | 33,812
Government | Energy |  |
Revenue |  |
Revenue | 26,075 | 18,359
Government | Engineering and Consulting |  |
Revenue |  |
Revenue | 18,095 | 15,453
Utilities |  |
Revenue |  |
Revenue | 50,550 | 48,458
Utilities | Energy |  |
Revenue |  |
Revenue | 50,491 | 48,437
Utilities | Engineering and Consulting |  |
Revenue |  |
Revenue | 59 | 21
Time-and-Materials Contract |  |
Revenue |  |
Revenue | 22,263 | 21,819
Time-and-Materials Contract | Energy |  |
Revenue |  |
Revenue | 7,709 | 8,818
Time-and-Materials Contract | Engineering and Consulting |  |
Revenue |  |
Revenue | 14,554 | 13,001
Unit-based Contract |  |
Revenue |  |
Revenue | 48,543 | 45,941
Unit-based Contract | Energy |  |
Revenue |  |
Revenue | 44,927 | 42,957
Unit-based Contract | Engineering and Consulting |  |
Revenue |  |
Revenue | 3,616 | 2,984
Fixed-Price Contract |  |
Revenue |  |
Revenue | 31,797 | 24,078
Fixed-Price Contract | Energy |  |
Revenue |  |
Revenue | 30,649 | 23,110
Fixed-Price Contract | Engineering and Consulting |  |
Revenue |  |
Revenue | $ 1,148 | $ 968

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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