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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Operating revenues | $ 552,335,000 | $ 367,593,000 | $ 2,140,493,000 | $ 1,624,085,000 |
Loans receivable in other noncurrent assets | 33,800,000 |  | 33,800,000 |  | $ 32,300,000
Proceeds from sale leaseback transactions |  |  | 17,300,000 | 0 |
Proceeds from sale leaseback transactions - solar |  |  | 3,300,000 | 17,673,000 |
Clean Energy Ventures |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Proceeds from sale leaseback transactions - solar |  |  | 3,300,000 | 17,700,000 |
NJNG |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Proceeds from sale leaseback transactions |  |  | 17,300,000 | $ 0 |
Financial Asset, Not Past Due |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Loans receivable in other current assets | 14,400,000 |  | $ 14,400,000 |  | $ 14,200,000
Minimum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Loans receivable, term |  |  | 2 years |  |
Maximum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Loans receivable, term |  |  | 10 years |  |
Energy Services |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Operating revenues | 10,300,000 |  | $ 42,700,000 |  |
Deferred revenue | $ 44,100,000 |  | $ 44,100,000 |  |

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