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INVESTMENTS - Narrative (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
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 | 0 | (300,000) | $ 0
Business Acquisition [Line Items] |  |  |
Acquisition-related contingent consideration | 7,976,000 | $ 5,920,000 |
ID R&D |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition-related contingent consideration | $ 8,000,000 |  |

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