NET GAIN ON TRADING SECURITIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Number of equity securities exchanged (in shares)	5,350,000	1,000,000
Realized gain on the sale of equity securities	$ 51,240	$ 39,658
Unrealized gain on the sale of equity securities	$ 52,072	$ 36,079

Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration