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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Borrowings - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Sep. 30, 2022	Sep. 30, 2021
Principal Outstanding
Total borrowings	$ 943,638	$ 939,476
Current portion	0	372
Total borrowings, non-current	943,638	939,104
Carrying Value
Total borrowings	619,519	813,266
Current portion	0	372
Total borrowings, non-current	619,519	812,894
Notes payable - related party
Principal Outstanding
Total borrowings	197,851	194,419
Carrying Value
Total borrowings	113,120	150,427
Delayed Draw Term Loan \| Secured Debt
Principal Outstanding
Total borrowings	197,851	194,419
Carrying Value
Total borrowings	113,120	150,427
Equipment financing facility
Carrying Value
Total borrowings	$ 0	372
Equipment financing facility \| Line of Credit
Debt Instrument
Effective Interest Rate	16.20%		16.20%	14.30%
Principal Outstanding
Total borrowings	$ 0	372
Carrying Value
Total borrowings	$ 0	372
May 2025 Convertible Notes \| Secured Debt
Debt Instrument
Effective Interest Rate	7.80%
Principal Outstanding
Total borrowings	$ 50,000	50,000
Carrying Value
Total borrowings	$ 48,125	48,044
November 2025 Convertible Notes \| Secured Debt
Debt Instrument
Effective Interest Rate	14.20%
Principal Outstanding
Total borrowings	$ 600,000	600,000
Carrying Value
Total borrowings	372,215	530,096
DOE Loan Facility
Carrying Value
Total borrowings	$ 86,059	84,327
DOE Loan Facility \| Line of Credit
Debt Instrument
Effective Interest Rate	7.70%
Principal Outstanding
Total borrowings	$ 95,787	94,685
Carrying Value
Total borrowings	$ 86,059	$ 84,327
DOE Loan Facility First Draw \| Line of Credit
Debt Instrument
Effective Interest Rate	7.60%
DOE Loan Facility Second Draw \| Line of Credit
Debt Instrument
Effective Interest Rate	8.00%