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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 18, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) | 6,186,644 |  | 6,186,644 |  |
Granted (in shares) |  |  | 32,151 |  |
Stock-based compensation expense | $ 19,947 | $ 33,390 | $ 59,949 | $ 91,697 |
Employee Stock Option |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Intrinsic value of options exercised | 6,500 | 1,600 | 10,100 | 24,900 |
Stock-based compensation expense | 2,100 | 2,600 | 6,700 | 8,300 |
Unrecognized pre-tax compensation expense | 5,300 |  | $ 5,300 |  |
Weighted average period to recognize pre-tax compensation expense |  |  | 12 months |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | 17,800 | $ 33,700 | $ 53,200 | $ 83,400 |
Weighted average period to recognize pre-tax compensation expense |  |  | 2 years 3 months 18 days |  |
Unrecognized pre-tax compensation expense | $ 131,600 |  | $ 131,600 |  |
2004 Equity Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares reserve for issuance (in shares) | 68,555 |  | 68,555 |  |
2013 Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares reserve for issuance (in shares) | 3,440,076 |  | 3,440,076 |  |
Number of shares forfeited (in shares) |  |  | 197,596 |  |
2021 Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  | 8,000,000
Granted (in shares) |  |  | 1,977,114 |  |
Inducement Awards | Employee Stock Option |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares reserve for issuance (in shares) | 712,454 |  | 712,454 |  |
Inducement Awards | Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares reserve for issuance (in shares) | 746,175 |  | 746,175 |  |

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