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Fair Value Measurements - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2021 | Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cost method investments | $ 8,900,000 | $ 8,900,000 | $ 8,900,000
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Amount invested into non-marketable convertible note | 1,000,000.0 | 1,000,000.0 |
Changes in fair value | $ 0 | $ 0 |

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