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INVESTMENTS - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
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Investments, Debt and Equity Securities [Abstract] |  |
2023 | $ 4,806 |
2024 | 28,818 |
2025 | 86,790 |
2026 | 160,943 |
2027 | 241,385 |
Thereafter | 151,330 |
Total contractual repayments | 674,072 |
Adjustments to cost basis of debt investments | (1,333) |
Investments in equity securities | 62,443 |
Investment owned, at cost | 735,182 | $ 656,053
Debt investments with maturity dates prior to period end | $ 200 |

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