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INVESTMENTS - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022 | [2]
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Investments, Debt and Equity Securities [Abstract] |  |  |
2024 | $ 24,385 |  |
2025 | 90,725 |  |
2026 | 137,108 |  |
2027 | 254,660 |  |
2028 | 146,440 |  |
Thereafter | 7,762 |  |
Total contractual repayments | 661,080 |  |
Adjustments to cost basis of debt investments | (1,254) |  |
Investments in equity securities | 62,443 |  |
Investment owned, at cost | 722,269 | [1] | $ 656,053
Debt investments with maturity dates prior to period end | $ 200 |  |
[1] | 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.
[2] | Cumulative gross unrealized depreciation for federal income tax purposes is $52.3 million; cumulative gross unrealized appreciation for federal income tax purposes is $35.2 million. Cumulative net unrealized depreciation is $17.1 million, based on a tax cost of $666.7 million.

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