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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 18, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Common stock, share reserve for issuance (in shares) |  | 4,553,827 |  | 4,553,827 |  |
Granted (in shares) |  |  |  | 0 | 0 |
Stock-based compensation expense |  | $ 16,588 | $ 20,613 | $ 34,273 | $ 40,002 |
Options |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Intrinsic value of options exercised |  | 2,500 | 1,400 | 3,100 | 3,600 |
Stock-based compensation expense |  | 600 | 2,200 | 2,100 | 4,600 |
Unrecognized pre-tax compensation expense |  | 800 |  | $ 800 |  |
Weighted average period to recognize pre-tax compensation expense |  |  |  | 4 months |  |
Restricted stock units |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  | 16,000 | $ 18,400 | $ 32,200 | $ 35,400 |
Weighted average period to recognize pre-tax compensation expense |  |  |  | 1 year 8 months 12 days |  |
Unrecognized pre-tax compensation expense |  | $ 112,000 |  | $ 112,000 |  |
2004 Equity Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares reserve for issuance (in shares) |  | 0 |  | 0 |  |
2013 Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares reserve for issuance (in shares) |  | 2,967,887 |  | 2,967,887 |  |
Number of shares forfeited (in shares) |  |  |  | 158,678 |  |
2021 Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  | 8,000,000
Number of shares forfeited (in shares) |  |  |  | 134,389 |  |
Granted (in shares) |  |  |  | 3,689,089 |  |
Inducement Awards | Options |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares reserve for issuance (in shares) |  | 688,165 |  | 688,165 |  |
Inducement Awards | Restricted stock units |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares reserve for issuance (in shares) |  | 637,563 |  | 637,563 |  |
Visirna ESOP |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized (in shares) | 20,000,000 |  |  |  |  |
Granted (in shares) | 7,500,000 |  |  |  |  |
Stock-based compensation expense |  | $ 1,200 |  | $ 3,200 |  |

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