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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
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