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Financial Highlights - Summary of Financial Highlights (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Investment Company Financial Highlights [Abstract]          
Net asset value, beginning of year     $ 11.62 $ 12.62  
Net investment income $ 0.35 $ 0.29 0.65 [1] 0.61 [1]  
Net change in realized and unrealized (loss) gain [1]     (0.53) (0.06)  
Net increase in net assets resulting from operations 0.15 0.18 0.12 [1] 0.55 [1]  
Distributions to stockholders [1],[2]     (0.57) (0.57)  
Issuance of common stock     (0.02) 0.02  
Net asset value, end of year 11.15 12.62 11.15 12.62  
Per share market value, end of year $ 10.61 $ 13.51 $ 10.61 $ 13.51  
Total return [3]     16.41% 10.30%  
Common stock, shares, outstanding 49,731,815 41,209,566 49,731,815 41,209,566 45,345,638
Ratios / Supplemental Data:          
Ratio of operating expenses to average net assets [4]     5.87% 5.44%  
Ratio of debt related expenses to average net assets [5]     7.28% 5.37%  
Ratio of total expenses to average net assets [5]     13.15% 10.80%  
Ratio of net investment income to average net assets [5]     11.32% 9.69%  
Net assets at end of year $ 554,669 $ 519,986 $ 554,669 $ 519,986  
Weighted average debt outstanding     $ 672,046 $ 808,594  
Weighted average debt per share [1]     $ 14.32 $ 20.60  
Asset coverage per unit [6] $ 1,856 $ 1,684 $ 1,856 $ 1,684  
Portfolio turnover rate [7]     7.93% 28.72%  
[1] Based on the weighted average shares outstanding for the respective periods.
[2] 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.
[3] Based on the change in market price per share during the periods and assumes distributions, if any, are reinvested.
[4] Excludes debt-related costs.
[5] Includes interest and expenses on debt (annualized) as well as Credit Facility amendment and debt issuance costs, if any, (not annualized).
[6] 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.
[7] Not annualized for periods less than one year.