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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 | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Debt Securities |  |  |  |
Reconciliation of changes in the fair value of our financial assets |  |  |  |
Assets at beginning of period | $ 41,029 | $ 38,551 | $ 29,294 | $ 37,440
Purchases | 0 | 0 | 0 | 250
Accrued interest | 473 | 450 | 1,383 | 1,316
Total gains: |  |  |  |
Included in earnings | 0 | 0 | 10,162 | (5)
Included in other comprehensive income (loss) | (280) | 0 | 383 | 0
Assets at end of period | 41,222 | 39,001 | 41,222 | 39,001
Equity Securities Without Readily Determinable Fair Value |  |  |  |
Reconciliation of changes in the fair value of our financial assets |  |  |  |
Assets at beginning of period | 45,519 | 30,152 | 30,090 | 28,232
Purchases | 594 | 1,105 | 1,528 | 3,641
Disposals | (27,117) | 0 | (27,117) | (616)
Transfer in | 320 | 0 | 320 | 0
Total gains: |  |  |  |
Included in earnings | 624 | 0 | 15,119 | 0
Assets at end of period | $ 19,940 | $ 31,257 | $ 19,940 | $ 31,257

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