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Investments - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2022 | Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Other-than-temporary impairment charges recognized in earnings | $ 0 | $ 0 | $ 0 |  |
Realized gains (losses) from sale of available-for-sale securities | (300) | 0 |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Acquisition-related consideration, current | 5,920 | 11,050 |  | $ 5,900 | $ 10,200
Acquisition-related consideration, noncurrent | 0 | $ 5,720 |  |  |
ID R&D |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Acquisition-related consideration, current | 5,900 |  |  |  |
Maximum payout of contingent consideration liability | $ 22,100 |  |  |  |

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