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Commitments and Contingencies - Long-Term Take-or-Pay Natural Gas Purchase Contracts (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Jan. 08, 2024 | Sep. 30, 2023 | Nov. 07, 2022
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Rimere | Loan Commitment to an Equity Method Investee |  |  |  |
Fixed commitments under the contract payable in future |  |  |  |
Irrevocably committed amount |  | $ 10.0 |  |
Amount Funded |  |  | $ 5.5 |
Rimere | 2022 Note Purchase Agreement |  |  |  |
Fixed commitments under the contract payable in future |  |  |  |
Irrevocably committed amount |  |  |  | $ 5.5
Rimere | 2024 Note Purchase Agreement |  |  |  |
Fixed commitments under the contract payable in future |  |  |  |
Irrevocably committed amount |  | $ 10.0 |  |
Amount Funded | $ 3.5 |  |  |
Rimere | Convertible promissory note | 2022 Note Purchase Agreement |  |  |  |
Fixed commitments under the contract payable in future |  |  |  |
Interest rate |  |  |  | 7.00%
Rimere | Convertible promissory note | 2024 Note Purchase Agreement |  |  |  |
Fixed commitments under the contract payable in future |  |  |  |
Interest rate |  | 8.00% |  |
Natural Gas Supply Agreement | DGS |  |  |  |
Fixed commitments under the contract payable in future |  |  |  |
2024 | $ 3.7 |  |  |

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