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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Reconciliation of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3 (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024
Debt Securities |  |  |
Reconciliation of changes in the fair value of our financial assets |  |  |
Assets at beginning of period |  | $ 29,294 | $ 37,440
Purchases |  | 0 | 250
Accrued interest |  | 1,860 | 1,771
Total gains or (losses): |  |  |
Included in earnings |  | (29,287) | (10,167)
Included in other comprehensive income (loss) |  | 383 | 0
Assets at end of period | $ 2,250 | 2,250 | 29,294
Equity Securities Without Readily Determinable Fair Value |  |  |
Reconciliation of changes in the fair value of our financial assets |  |  |
Assets at beginning of period |  | 30,090 | 28,232
Purchases |  | 2,769 | 3,870
Disposals | (27,100) | (27,117) | (616)
Transfer in |  | 320 | 0
Total gains or (losses): |  |  |
Included in earnings |  | 14,799 | (1,396)
Assets at end of period | $ 20,861 | $ 20,861 | $ 30,090

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