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Financial Highlights - Summary of Financial Highlights (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Investment Company, Financial Highlights [Abstract]          
Net asset value, beginning of year $ 11.31 [1] $ 11.13 $ 11.62 $ 12.62 $ 12.31
Net investment income [2] 1.16 1.18 1.33 1.18 1.02
Net change in realized and unrealized (loss) gain [2] (0.44) 0.22 (0.56) (1.1) 0.44
Net increase in net assets resulting from operations [2] 0.72 1.4 0.77 0.08 1.46
Distribution of net investment income [2],[3] (1.23) (1.23) (1.19) (1.14) (1.14)
Distribution of realized gains [2],[3] 0 0 0 0 0
Total distributions to stockholders [2],[3] (1.23) (1.23) (1.19) (1.14) (1.14)
Accretive (Dilutive) effect of common stock issuance 0.03 0.01 (0.08) 0.06 0
Per share market value, end of year 10.83 [1] 11.31 [1] 11.13 11.62 12.62
Per share market value, end of year $ 8.89 $ 11.57 $ 10.66 $ 9.6 $ 12.79
Total return [4] (13.64%) 20.99% 23.84% (17.76%) 66.47%
Shares outstanding at end of year 99,217,896 77,579,896 58,734,702 45,345,638 38,880,728
Ratios / Supplemental Data:          
Ratio of operating expenses to average net assets [5] 5.62% 5.48% 5.90% 5.34% 3.77%
Ratio of debt related expenses to average net assets [6] 9.39% 9.12% 6.68% 5.85% 5.00%
Ratio of total expenses to average net assets [6] 15.01% 14.60% 12.58% 11.19% 8.77%
Ratio of net investment income to average net assets [6] 10.42% 10.44% 11.82% 9.55% 8.07%
Net assets at end of year $ 1,074,516 $ 877,294 $ 653,605 $ 527,092 $ 490,611
Weighted average debt outstanding $ 1,411,052 $ 803,084 $ 615,068 $ 698,765 $ 622,739
Weighted average debt per share [2] $ 15.25 $ 12.22 $ 12.1 $ 17.06 $ 16.06
Asset coverage per unit [7] $ 1,603 $ 1,742 $ 2,304 $ 1,784 $ 1,746
Portfolio turnover ratio 32.85% 29.66% 28.64% 45.03% 62.58%
[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.