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Change in Net Assets from Operations Per Common Share - Summary of Information Sets Forth for Computation of Basic and Diluted Per Share Net Increase in Net Assets Resulting from Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]        
Net Income (Loss) $ 1,225 $ 31,111 $ 29,553 $ 53,579
Denominator for basic weighted average shares 90,086,785 61,151,898 85,828,775 59,936,696
Denominator for diluted weighted average shares 90,086,785 61,151,898 85,828,775 59,936,696
Basic and diluted net increase in net assets per share resulting from operations $ 0.01 $ 0.51 $ 0.34 [1] $ 0.89 [1]
[1] Based on the weighted average shares outstanding for the respective periods.