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SEGMENT AND GEOGRAPHICAL INFORMATION - Concentration Risk (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jul. 01, 2022 | Jun. 30, 2023 | Jul. 01, 2022
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Top Ten Customers |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) | 51.70% | 55.40% | 51.40% | 54.40%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Los Angeles Department of Water and Power |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) | 10.30% | 14.60% | 10.60% | 15.80%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Dormitory Authority-State New York |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) | 10.70% |  |  |
Revenue from Contract with Customer Benchmark | Geographic Concentration Risk | California |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) | 41.40% | 40.90% | 41.90% | 42.20%
Revenue from Contract with Customer Benchmark | Geographic Concentration Risk | New York |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) | 26.10% | 19.60% | 25.30% | 20.20%
Revenue from Contract with Customer, Segment Benchmark | Customer Concentration Risk | Los Angeles Department of Water and Power | Energy |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) | 12.50% | 17.60% | 13.00% | 19.20%
Revenue from Contract with Customer, Segment Benchmark | Customer Concentration Risk | Dormitory Authority-State New York | Energy |  |  |  |
Concentration Risk |  |  |  |
Concentration risk (as a percent) | 13.00% |  | 11.60% |

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