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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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