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CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS (Parentheticals) - $ / shares | 12 Months Ended
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Sep. 30, 2025 | [1],[2] | Sep. 30, 2024 | [1],[2] | Sep. 30, 2023 | [1],[2] | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |  |  |  |  |
Net investment income (in USD per share) | $ 1.98 | $ 1.98 | $ 1.89 | $ 1.52 | $ 1.50 | $ 1.60 | $ 1.64 | $ 1.68 | $ 1.68 | $ 1.40
Distributions to common stockholders from realized gains (in USD per share) | $ 0.50 | $ 0 | $ 0.00 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0.28
[1] | Per share amounts have been adjusted on a retroactive basis to reflect the Reverse Stock Split effected on April 4, 2024. Refer to Note 2—Summary of Significant Accounting Policies for additional information.
[2] | Refer to Note 9 – Distributions to Common Stockholders for additional information.

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