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Balance Sheet Accounts (Tables) | 6 Months Ended
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Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Property and Equipment | The following table summarizes the Company’s major classes of property, plant and equipment:
| March 31, 2025 |  | September 30, 2024
| (in thousands)
Land | $ | 2,996 |  |  | $ | 2,996 |
Buildings | 248,893 |  |  | 75,988 |
Research equipment | 60,259 |  |  | 65,353 |
Manufacturing equipment | 13,812 |  |  | — |
Furniture | 5,594 |  |  | 5,594 |
Computers and software | 1,033 |  |  | 981 |
Leasehold improvements | 104,401 |  |  | 104,410 |
Construction in progress | 16,245 |  |  | 188,731 |
| 453,233 |  |  | 444,053 |
Less: Accumulated depreciation and amortization | (68,430) |  |  | (58,021) |
Property, plant and equipment, net | $ | 384,803 |  |  | $ | 386,032 |
Schedule of Accrued Expenses | Accrued expenses consisted of the following as of:
| March 31, 2025 |  | September 30, 2024
| (in thousands)
Accrued R&D expenses | $ | 42,963 |  |  | $ | 28,069 |
Accrued R&D expenses; co-development | 28,755 |  |  | 23,351 |
Accrued capital expenditures | 358 |  |  | 4,206 |
Other | 6,374 |  |  | 7,391 |
Total accrued expenses | $ | 78,450 |  |  | $ | 63,017 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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