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Commitments And Contingencies (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
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Other Commitments [Line Items] |  |
Estimated minimum liability for environmental remediation | $ 3,700 |
Other Regulatory Liabilities | 137,025 | $ 151,452
Environmental Site Remediation Costs |  |
Other Commitments [Line Items] |  |
Other Regulatory Liabilities | $ 2,100 |

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