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Leases - Narrative (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) ft² option | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 25, 2023 USD ($) | Dec. 23, 2022 | Nov. 19, 2021 USD ($) ft² option
Lessee Lease Description [Line Items] |  |  |  |  |  |
Short-term lease cost | $ | $ 1.4 | $ 0.3 | $ 0.0 |  |  |
Research Facility in San Diego | California |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Lease term |  |  |  |  |  | 15 years
Office space leases (in sq ft) | ft² |  |  |  |  |  | 144,000
Operating lease renewal term |  |  |  |  |  | 10 years
Maximum additional tenant improvement allowance | $ |  |  |  | $ 23.6 |  | $ 7.2
Interest per annum |  |  |  | 9.00% |  | 7.00%
Additional tenant improvement allowance liability | $ | $ 27.8 |  |  |  |  |
Research Facility in San Diego | California | Sorrento Valley Owner (DE) LLC |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Lease term |  |  |  |  | 6 months |
Research Facility in San Diego | California | Maximum |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Number of options to renew | option |  |  |  |  |  | 1
Corporate Headquarters In Pasadena | California |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Office space leases (in sq ft) | ft² | 49,000 |  |  |  |  |
Corporate Headquarters In Pasadena | California | Colorado Owner, LLC |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Number of options to renew | option | 1 |  |  |  |  |
Operating lease renewal term | 5 years |  |  |  |  |
Research Facility in Madison | Wisconsin |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Office space leases (in sq ft) | ft² | 115,000 |  |  |  |  |
Number of options to renew | option | 2 |  |  |  |  |
Operating lease renewal term | 5 years |  |  |  |  |

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