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SUBSEQUENT EVENTS - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 13, 2024 | Oct. 31, 2024 | Apr. 30, 2024 | Feb. 29, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Subsequent Event [Line Items] |  |  |  |  |  |  |
Purchase of investments |  |  |  |  | $ 177,649 | $ 175,477 | $ 274,898
Perimeter Solutions Group |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Purchase of investments |  |  |  | $ 15,000 |  |  |
Perimeter Solutions Group | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Net proceeds from the sale of investments |  | $ 15,500 |  |  |  |  |
Investment company, prepayment fee |  | 500 |  |  |  |  |
Antenna Research Associates, Inc | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Net proceeds from the sale of investments |  | 31,300 |  |  |  |  |
Realized investment gains |  | $ 59,300 |  |  |  |  |
Home Healthcare, LLC ("Giving Home") |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Net proceeds from the sale of investments |  |  | $ 29,700 |  |  |  |
Investment company, prepayment fee |  |  | $ 900 |  |  |  |
Home Healthcare, LLC ("Giving Home") | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Purchase of investments | $ 28,900 |  |  |  |  |  |

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