Collaboration and License Agreements - Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 3,551	$ 240,735	$ 243,231
GSK
Disaggregation of Revenue [Line Items]
Revenue	2,685	29,657	124,764
Horizon
Disaggregation of Revenue [Line Items]
Revenue	0	23,206	29,181
Takeda
Disaggregation of Revenue [Line Items]
Revenue	866	162,516	85,834
Janssen
Disaggregation of Revenue [Line Items]
Revenue	0	356	3,452
Amgen
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 25,000	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details