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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment loss related to investments | $ 0 | $ 0 | $ (31,854) |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Amount invested in non-marketable convertible note |  |  |  | $ 2,000
Impairment loss related to investments | $ 2,000 |  |  |

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