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INVESTMENTS - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023 | [2]
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Investments, Debt and Equity Securities [Abstract] |  |  |
2025 | $ 16,322 |  |
2026 | 160,366 |  |
2027 | 227,287 |  |
2028 | 193,374 |  |
2029 | 78,697 |  |
Thereafter | 20,000 |  |
Total contractual repayments | 696,046 |  |
Adjustments to cost basis of debt investments | (1,421) |  |
Investments in equity securities | 76,386 |  |
Investment owned, at cost | 771,011 | [1] | $ 722,269
Debt investments with maturity dates prior to period end | $ 200 |  |
[1] | Cumulative gross unrealized depreciation for federal income tax purposes is $66.1 million; cumulative gross unrealized appreciation for federal income tax purposes is $85.8 million. Cumulative net unrealized appreciation is $19.7 million, based on a tax cost of $776.5 million.
[2] | Cumulative gross unrealized depreciation for federal income tax purposes is $56.9 million; cumulative gross unrealized appreciation for federal income tax purposes is $33.7 million. Cumulative net unrealized depreciation is $23.2 million, based on a tax cost of $728.0 million.

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