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Summary Of Significant Accounting Policies (Schedule Of Other Accruals And Current Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
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Summary Of Significant Accounting Policies [Line Items] |  |
Accrued Capital Expenditures | $ 52,852 | $ 47,344
Regulatory Liabilities | 24,235 | 29,352
Reserve for Gas Replacement | 1,316 | 0
Liability for Royalty and Working Interests | 23,673 | 15,007
Non-Qualified Benefit Plan Liability | 14,135 | 14,135
Other | 50,949 | 57,065
Other Accruals and Current Liabilities | 172,409 | 162,903
Federal |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Federal Income Taxes Payable | $ 5,249 | $ 0

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