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SUBSEQUENT EVENTS - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
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Jul. 26, 2023 | Jun. 30, 2023 | Jun. 30, 2022
Subsequent Event [Line Items] |  |  |
Purchase of investments |  | $ 148,084 | $ 188,851
Subsequent Event | Gray Matter Systems, LLC |  |  |
Subsequent Event [Line Items] |  |  |
Purchase of investments | $ 5,000 |  |

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