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Investments - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Other-than-temporary impairment charges recognized | $ 0 | $ 0 | $ 0 | $ 0 |
Realized gains (losses) from sale of available-for-sale securities | 0 | $ 0 | 0 | $ 0 |
Acquisition-related contingent consideration | $ 575,000 |  | $ 575,000 |  | $ 1,601,000

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