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Financial Highlights - Summary of Financial Highlights (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Investment Company, Financial Highlights [Abstract] |  |  |  |  |  |  |  |
Net Asset Value Per Share, Beginning Balance |  | $ 11.13 | [1] | $ 11.62 |  | $ 12.62 | $ 12.31 | $ 12.97
Net investment income | [2] | 1.18 |  | 1.33 |  | 1.18 | 1.02 | 1.12
Net change in realized and unrealized (loss) gain | [2] | 0.22 |  | (0.56) |  | (1.1) | 0.44 | (0.65)
Net increase in net assets resulting from operations | [2] | 1.4 |  | 0.77 |  | 0.08 | 1.46 | 0.47
Distribution of net investment income | [2],[3] | (1.23) |  | (1.19) |  | (1.14) | (1.14) | (1.14)
Distribution of realized gains | [2],[3] | 0 |  | 0 |  | 0 | 0 |
Total distributions to stockholders | [2],[3] | (1.23) |  | (1.19) |  | (1.14) | (1.14) | (1.14)
(Dilutive) effect of common stock issuance |  | 0.01 |  | (0.08) |  | 0.06 | 0 |
Net Asset Value Per Share, Ending Balance |  | 11.31 | [1] | 11.13 | [1] | 11.62 | 12.62 | 12.31
Per share market value, end of year |  | $ 11.57 |  | $ 10.66 |  | $ 9.6 | $ 12.79 | $ 8.44
Total return | [4] | 20.99% |  | 23.84% |  | (17.76%) | 66.47% | (17.15%)
Shares outstanding at end of year |  | 77,579,896 |  | 58,734,702 |  | 45,345,638 | 38,880,728 | 38,772,074
Ratios / Supplemental Data: |  |  |  |  |  |  |  |
Ratio of operating expenses to average net assets | [5] | 5.48% |  | 5.90% |  | 5.34% | 3.77% | 5.19%
Ratio of debt related expenses to average net assets | [6] | 9.12% |  | 6.68% |  | 5.85% | 5.00% | 5.63%
Ratio of total expenses to average net assets | [6] | 14.60% |  | 12.58% |  | 11.19% | 8.77% | 10.82%
Ratio of net investment income to average net assets | [6] | 10.44% |  | 11.82% |  | 9.55% | 8.07% | 9.00%
Net assets at end of year |  | $ 877,294 |  | $ 653,605 |  | $ 527,092 | $ 490,611 | $ 477,270
Weighted average debt outstanding |  | $ 803,084 |  | $ 615,068 |  | $ 698,765 | $ 622,739 | $ 737,209
Weighted average debt per share | [2] | $ 12.22 |  | $ 12.1 |  | $ 17.06 | $ 16.06 | $ 19.01
Asset coverage per unit | [7] | $ 1,742 |  | $ 2,304 |  | $ 1,784 | $ 1,746 | $ 1,677
Portfolio turnover ratio |  | 29.66% |  | 28.64% |  | 45.03% | 62.58% | 35.08%
[1] | NAV per share is determined as of the last day in the relevant quarter and therefore may not reflect the NAV per share on the date of the high and low sales prices. The NAVs shown are based on outstanding shares at the end of each period.
[2] | Based on the weighted average shares outstanding for the respective periods.
[3] | The tax status of distributions is calculated in accordance with income tax regulations, which may differ from amounts determined under GAAP, and reported on Form 1099-DIV each calendar year.
[4] | Based on the change in market price per share during the periods and assumes distributions, if any, are reinvested.
[5] | Excludes debt related costs.
[6] | Includes interest and expenses on debt (annualized) as well as Credit Facility amendment and debt issuance costs, if any (not annualized).
[7] | The asset coverage ratio for a class of senior securities representing indebtedness is calculated on our consolidated total assets, less all liabilities and indebtedness not represented by senior securities, divided by the senior securities representing indebtedness at par (changed from fair value). This asset coverage ratio is multiplied by $1,000 to determine the asset coverage per unit.

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