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Investments - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
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 | (300,000) | $ 0 | (300,000) | $ 0 |
Acquisition-related consideration, current | 10,790,000 |  | 10,790,000 |  | $ 11,050,000
Acquisition-related contingent consideration | $ 5,200,000 |  | $ 5,200,000 |  | $ 5,720,000

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