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Commitments and Contingencies - Long-Term Take-or-Pay Natural Gas Purchase Contracts (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jan. 08, 2024 | Sep. 30, 2023 | Nov. 07, 2022
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2022 Note Purchase Agreement |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |
Amount of funding commitment |  |  |  | $ 5.5
Promissory notes interest rate |  |  |  | 7.00%
Amount Funded |  |  | $ 5.5 |
2024 Note Purchase Agreement |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |
Amount of funding commitment |  | $ 10.0 |  |
Promissory notes interest rate |  | 8.00% |  |
Amount Funded | $ 9.1 |  |  |

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