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INVESTMENTS - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022
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Investments, Debt and Equity Securities [Abstract] |  |  |
Contractual maturities of available-for-sale securities due within one year | $ 40,700 | $ 58,300 |
Contractual maturities of available-for-sale securities due beyond one year to five years | 2,800 | 10,600 |
Acquisition-related consideration, current | $ 8,013 | $ 5,920 | $ 5,900

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