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INVESTMENTS - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
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Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Contractual maturities of available-for-sale securities due within one year | $ 38,700 | $ 74,700
Contractual maturities of available-for-sale securities due beyond one year to five years | 10,200 | 1,300
Contingent Consideration |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Acquisition-related contingent consideration | $ 0 | $ 7,976

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