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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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