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Summary of Significant Accounting Policies - Components of Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Summary of Significant Accounting Policies [Line Items] |  |
Prepayments | $ 18,463 | $ 18,966
Prepaid Property and Other Taxes | 14,187 | 14,186
Regulatory Assets | 38,264 | 36,373
Other Current Assets | 92,229 | 100,260
Federal |  |
Summary of Significant Accounting Policies [Line Items] |  |
Income Taxes Receivable | 8,154 | 14,602
State |  |
Summary of Significant Accounting Policies [Line Items] |  |
Income Taxes Receivable | $ 13,161 | $ 16,133

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