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Commitments And Contingencies (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
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Other Commitments [Line Items] |  |
Estimated minimum liability for environmental remediation | $ 4,000 |
Other Regulatory Liabilities | 147,561 | $ 151,452
Environmental Site Remediation Costs |  |
Other Commitments [Line Items] |  |
Other Regulatory Liabilities | $ 3,300 |

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