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Commitments and Contingencies - Additional Information (Details) ft² in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 20, 2021 USD ($) ft² a | Sep. 30, 2023 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($)
Other Commitments [Line Items] |  |  |  |
Contingent liabilities |  | $ 0 |  | $ 0
Construction in progress |  | 166,655,000 |  | $ 56,373,000
Tax increment financing award | $ 16,000,000 |  |  |
Maximum state income tax credits under agreement | $ 2,500,000 |  |  |
State income tax credits |  | 1,500,000 |  |
Technology License Commitments | ARO-ENaC and ARO-HIF2 Candidates |  |  |  |
Other Commitments [Line Items] |  |  |  |
Milestone payments |  |  | $ 2,400,000 |
Verona Technology Park | Wisconsin |  |  |  |
Other Commitments [Line Items] |  |  |  |
Land purchased (in acres) | a | 13 |  |  |
Drug Manufacturing Facility | Wisconsin |  |  |  |
Other Commitments [Line Items] |  |  |  |
Planned area of site (in sq ft) | ft² | 160 |  |  |
Laboratory And Office Facility | Wisconsin |  |  |  |
Other Commitments [Line Items] |  |  |  |
Planned area of site (in sq ft) | ft² | 140 |  |  |
Facilities |  |  |  |
Other Commitments [Line Items] |  |  |  |
Construction in progress |  | 166,200,000 |  |
Facilities | Minimum |  |  |  |
Other Commitments [Line Items] |  |  |  |
Amount intended to invest for buildout of facilities |  | 120,000,000 |  |
Facilities | Maximum |  |  |  |
Other Commitments [Line Items] |  |  |  |
Amount intended to invest for buildout of facilities |  | $ 130,000,000 |  |

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