Commitments and Contingencies (Details) ft² in Thousands	Sep. 30, 2025 USD ($) ft²	Sep. 30, 2024 USD ($)
Other Commitments [Line Items]
Contingent liabilities	$ 0	$ 0
Drug Manufacturing Facility | Wisconsin
Other Commitments [Line Items]
Planned area of site (in sq ft) | ft²	160
Laboratory and Office Facility
Other Commitments [Line Items]
Capital expenditures incurred	$ 78,000,000.0
Laboratory and Office Facility | Wisconsin
Other Commitments [Line Items]
Planned area of site (in sq ft) | ft²	140
Facilities
Other Commitments [Line Items]
Capital expenditures incurred	$ 296,400,000
Buildings
Other Commitments [Line Items]
Capital expenditures incurred	173,400,000
Manufacturing equipment
Other Commitments [Line Items]
Capital expenditures incurred	18,600,000
Construction in progress
Other Commitments [Line Items]
Capital expenditures incurred	15,900,000
Research equipment
Other Commitments [Line Items]
Capital expenditures incurred	7,900,000
Furniture
Other Commitments [Line Items]
Capital expenditures incurred	$ 2,600,000