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Summary Of Significant Accounting Policies (Schedule Of Other Accruals And Current Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
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Summary Of Significant Accounting Policies [Line Items] |  |
Accrued Capital Expenditures | $ 40,449 | $ 47,344
Regulatory Liabilities | 16,285 | 29,352
Reserve for Gas Replacement | 27,614 | 0
Liability for Royalty and Working Interests | 30,697 | 15,007
Non-Qualified Benefit Plan Liability | 14,135 | 14,135
Other | 47,049 | 57,065
Other Accruals and Current Liabilities | 184,925 | 162,903
Federal |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Federal Income Taxes Payable | $ 8,696 | $ 0

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