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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2021 Megawatt | Sep. 30, 2024 USD ($) plan | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Number of megawatts | Megawatt | 5 |  |  |
Operating revenues |  | $ 1,796,539 | $ 1,962,994 | $ 2,905,979
Composite rate of depreciation |  | 2.69% | 2.68% | 2.66%
Depreciation and amortization |  | $ 166,567 | $ 152,941 | $ 129,249
Debt instrument, term |  | 7 years |  |
Basis spread on variable rate |  | 0.60% |  |
SBC interest rate |  | 4.33% | 4.79% | 3.85%
Deferred interest |  | $ 2,600 | $ 1,800 | $ 900
Loans receivable in other noncurrent assets |  | 53,600 | 39,000 |
Amounts reclassified from accumulated other comprehensive income, net of tax |  | $ 78 | 1,217 |
Number of noncontributory defined benefit retirement plans (in plans) | plan |  | 2 |  |
Number of noncontributory medical and life insurance plans (in plans) | plan |  | 2 |  |
Cash Flow Hedges |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax |  | $ 1,054 | 1,053 |
Financial Asset, Not Past Due |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Loans receivable in other current assets |  | 18,100 | 15,100 |
Storage and Transportation Property, Base Gas | Nonutility |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Base gas cost |  | $ 21,400 | 20,900 |
Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Storage and pipeline capacity, contract term |  | 1 year |  |
Loans receivable term |  | 3 years |  |
Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Storage and pipeline capacity, contract term |  | 10 years |  |
Loans receivable term |  | 10 years |  |
ES |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Operating revenues |  | $ 137,200 | 48,500 |
Deferred revenue |  | $ 22,300 | $ 58,700 |
ES | Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Storage and pipeline capacity, contract term |  | 1 year |  |
ES | Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Storage and pipeline capacity, contract term |  | 10 years |  |

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