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Summary Of Significant Accounting Policies (Schedule Of Other Accruals And Current Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
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Summary Of Significant Accounting Policies [Line Items] |  |
Accrued Capital Expenditures | $ 40,361 | $ 43,323
Regulatory Liabilities | 37,192 | 38,105
Reserve for Gas Replacement | 20,139 | 0
Liability for Royalty and Working Interests | 19,198 | 17,679
Non-Qualified Benefit Plan Liability | 13,052 | 13,052
Other | 42,277 | 48,815
Other Accruals and Current Liabilities | 183,966 | 160,974
Federal |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Federal Income Taxes Payable | $ 11,747 | $ 0

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