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Financial Highlights (Details) - $ / shares | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Common Stock [Member] |  |  |  |  |
Financial Highlights [Line Items] |  |  |  |  |
Net investment income/(loss) per share | $ 2.55 | $ 2.32 | $ 3.11 | $ 1.48 | $ 6.92

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