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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) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in the fair value of our financial assets |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, general and administrative | Selling, general and administrative
Level 3 |  |
Total gains: |  |
Included in earnings | $ 109 | $ 0
Level 3 | Debt Securities |  |
Reconciliation of changes in the fair value of our financial assets |  |
Assets at beginning of period | 29,294 | 37,440
Accrued interest | 455 | 433
Total gains: |  |
Included in earnings | 0 | (5)
Assets at end of period | 29,749 | 37,868
Level 3 | 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 | 646 | 291
Total gains: |  |
Assets at end of period | $ 30,845 | $ 28,523

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