Balance Sheet Accounts - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | ||
| Accrued research and development expenses | $ 35,648 | $ 30,330 |
| Accrued research and development expenses; co-development | 36,368 | 31,296 |
| Accrued capital expenditures | 1,084 | 277 |
| Accrued income taxes | 0 | 20,799 |
| Dividends declared by variable interest entity to noncontrolling shareholders | 2,110 | 0 |
| Other | 10,964 | 7,717 |
| Total accrued expenses | $ 86,174 | $ 90,419 |
| X | ||||||||||
- Definition Accrued Capital Expenditure, Current No definition available.
|
| X | ||||||||||
- Definition Accrued Research And Development Co-Development Expense, Current No definition available.
|
| X | ||||||||||
- Definition Accrued Research And Development Expense, Current No definition available.
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|