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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
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

X

- Definition

Amount funded of irrevocably committed amount to provide.

+ References

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- Definition

Maximum amount of irrecoverable amount committed to provide.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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- References

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- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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