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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2022 USD ($) plan | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Operating revenues | $ 2,905,979,000 | $ 2,156,613,000 | $ 1,953,668,000 |
Investment tax credit, solar property, percentage |  |  |  | 26.00%
Composite rate of depreciation | 2.66% | 2.42% | 2.65% |
Depreciation and amortization | $ 129,249,000 | $ 111,387,000 | $ 107,368,000 |
SBC interest rate | 3.85% | 1.68% | 1.97% |
Deferred interest | $ 857,000 | $ 346,000 | $ 511,000 |
Loans receivable in other noncurrent assets | 34,700,000 | 32,300,000 |  |
Gain (loss) amortized in earning | 219,000 | 223,000 |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | 4,122,000 | 4,293,000 |  |
Intangible assets, acquired wholesale natural gas energy | 2,300,000 |  |  |
Proceeds from sale leaseback transaction | 17,300,000 | 0 | 4,000,000 |
Proceeds from sale leaseback transactions - solar | $ 24,071,000 | 17,673,000 | 42,927,000 |
Number of noncontributory defined benefit retirement plans (in plans) | plan | 2 |  |  |
Number of noncontributory medical and life insurance plans (in plans) | plan | 2 |  |  |
Pension |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Employer discretionary contributions | $ 0 | 0 |  |
Employer contributions | 628,000 | 548,000 |  |
OPEB |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Employer contributions | 6,082,000 | 7,198,000 |  |
Clean Energy Ventures |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Proceeds from sale leaseback transactions - solar | 24,100,000 | 17,700,000 | 42,900,000 |
NJNG |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Proceeds from sale leaseback transaction | 17,300,000 | 0 | $ 4,000,000 |
Cash Flow Hedges |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | 1,054,000 | 1,021,000 |  |
Financial Asset, Not Past Due |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Loans receivable in other current assets | $ 14,500,000 | 14,200,000 |  |
Seven-Year Treasury Rate |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Debt instrument, term | 7 years |  |  |
Basis spread on variable rate | 0.60% |  |  |
Storage and transportation property, base gas | Unregulated |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Base gas cost | $ 15,100,000 | $ 7,900,000 |  |
Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Storage and pipeline capacity, contract term | 1 year |  |  |
Loans receivable term | 2 years |  |  |
Minimum | Clean Energy Ventures |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Term of lease | 5 years |  |  |
Minimum | NJNG |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Term of lease | 7 years |  |  |
Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Storage and pipeline capacity, contract term | 10 years |  |  |
Loans receivable term | 10 years |  |  |
Maximum | Clean Energy Ventures |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Term of lease | 15 years |  |  |
Maximum | NJNG |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Term of lease | 11 years |  |  |
Energy Services |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Operating revenues | $ 53,000,000 |  |  |
Deferred revenue | $ 33,800,000 |  |  |
Energy Services | Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Storage and pipeline capacity, contract term | 1 year |  |  |
Energy Services | Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Storage and pipeline capacity, contract term | 10 years |  |  |

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