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Summary Of Significant Accounting Policies (Components Of Other Current Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Summary Of Significant Accounting Policies [Line Items] |  |
Prepayments | $ 13,693 | $ 18,966
Prepaid Property and Other Taxes | 23,308 | 14,186
Regulatory Assets | 35,845 | 36,373
Other Current Assets | 85,123 | 100,260
Federal |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Income Taxes Receivable | 0 | 14,602
State |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Income Taxes Receivable | $ 12,277 | $ 16,133

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