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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jul. 31, 2021 Megawatt | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Number of megawatts | Megawatt | 5 |  |  |
Operating revenues |  | $ 723,567 | $ 675,842 |
Loans receivable in other noncurrent assets |  | 34,700 |  | $ 34,700
Proceeds from sale leaseback transactions - natural gas meters |  | 8,441 | 17,300 |
Proceeds from sale leaseback transactions - solar |  | 33,150 | 3,300 |
Clean Energy Ventures |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Proceeds from sale leaseback transactions - solar |  | 33,200 | 3,300 |
NJNG |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Proceeds from sale leaseback transactions - natural gas meters |  | 8,400 | 17,300 |
Financial Asset, Not Past Due |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Loans receivable in other current assets |  | $ 14,800 |  | 14,500
Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Loans receivable, term |  | 2 years |  |
Minimum | Clean Energy Ventures |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Sale leaseback transaction lease term |  | 5 years |  |
Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Loans receivable, term |  | 10 years |  |
Maximum | Clean Energy Ventures |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Sale leaseback transaction lease term |  | 15 years |  |
Energy Services |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Operating revenues |  | $ 20,000 | $ 22,100 |
Deferred revenue |  | $ 87,200 |  | $ 33,800

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