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SEGMENT AND GEOGRAPHICAL INFORMATION - Concentration Risk (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Oct. 01, 2021 | Sep. 30, 2022 | Oct. 01, 2021
Geographic Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | CALIFORNIA |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 37.20% | 38.90% | 40.30% | 36.20%
Geographic Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | NEW YORK |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 23.40% | 19.00% | 21.40% | 20.70%
Top Ten Customers, Three Months Ended 2022 September 30 | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 57.20% |  |  |
Top Ten Customers, Nine Months Ended 2022 September 30 | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  |  | 54.50% |
Top Ten Customers, Three Months Ended 2021 October 01 | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 52.40% |  |
Top Ten Customers, Nine Months Ended 2021 October 01 | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  |  |  | 46.80%
Pueblo County School District | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 13.30% |  |
Los Angeles Department of Water and Power | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 17.00% | 13.20% |
Los Angeles Department of Water and Power | Customer Concentration Risk [Member] | Revenue from Contract with Customer, Segment Benchmark [Member] | Energy |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 20.40% |  |
Pueblo County School District, Dormitory Authority State of New York, and Los Angeles Department of Water and Power | Customer Concentration Risk [Member] | Revenue from Contract with Customer, Segment Benchmark [Member] | Energy |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 38.30% |  |  |
Los Angeles Department of Water and Power and Pueblo County School District | Customer Concentration Risk [Member] | Revenue from Contract with Customer, Segment Benchmark [Member] | Energy |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  |  | 26.50% |
Los Angeles Department of Water and Power and Consolidated Edison of New York | Customer Concentration Risk [Member] | Revenue from Contract with Customer, Segment Benchmark [Member] | Energy |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  |  |  | 21.50%
City of Elk Grove | Customer Concentration Risk [Member] | Revenue from Contract with Customer, Segment Benchmark [Member] | Engineering and Consulting |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  |  |  | 12.20%

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