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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Income Tax Disclosure [Line Items] |  |  |  |  |
Provision (benefit) for income taxes | $ 52,348 | $ (1,605) | $ 105,875 | $ 48,907 |
Unrecognized tax benefits | 45,700 |  | 45,700 |  | $ 65,000
Income tax provision upon recognition of unrecognized tax benefit | 45,700 |  | 45,700 |  |
Unrecognized tax benefits, increase in valuation allowance upon recognition | 6,600 |  | 6,600 |  |
Potential decrease in unrecognized tax benefits | $ 1,000 |  | 1,000 |  |
Foreign Tax Jurisdiction [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Provision (benefit) for income taxes |  |  | $ (10,400) | $ 3,600 |

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