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INVESTMENTS - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023 | [1]
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Investments, Debt and Equity Securities [Abstract] |  |
2024 | $ 21,950 |
2025 | 42,960 |
2026 | 140,846 |
2027 | 253,699 |
2028 | 185,178 |
Thereafter | 44,847 |
Total contractual repayments | 689,480 |
Adjustments to cost basis of debt investments | (1,288) |
Investments in equity securities | 71,442 |
Investment owned, at cost | 759,634 | $ 722,269
Debt investments with maturity dates prior to period end | $ 200 |
[1] | Investment was exited subsequent to December 31, 2023. Refer to Note 12 – Subsequent Events in the accompanying Notes to the Consolidated Financial Statements for additional information.

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