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Organization and Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 02, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  | $ 69,400 |  | $ 69,400 |  |
Restricted cash |  | 2,200 |  | 2,200 |  |
Available-for-sale securities, at fair value |  | 367,272 |  | 367,272 |  | $ 292,735
Increase (decrease) in cash and investments |  |  |  | 33,000 |  |
Development regulatory and sales milestones payments |  | 2,700,000 |  | 2,700,000 |  |
Income tax expense (benefit) |  | 0 | $ 742 | (3,313) | $ 759 |
Underwriting Agreement |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |
Net proceeds | $ 429,300 |  |  |  |  |
Shares of common stock issued (in shares) | 15,790,000 |  |  |  |  |
Common stock offering price (in dollars per share) | $ 28.50 |  |  |  |  |
Aggregate purchase price paid by investors | $ 450,000 |  |  |  |  |
Amgen | Royalty Pharma Agreement |  |  |  |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |  |  |  |
Milestone payment receivable upon achievement of enrollment in phase 3 clinical trial |  | $ 50,000 |  | $ 50,000 |  |

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