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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 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Net Income (Loss) $ 19,298 $ 16,920 $ 48,852 $ 70,499
Denominator for basic weighted average shares 99,217,896 68,481,874 90,291,815 62,774,693
Denominator for diluted weighted average shares 99,217,896 68,481,874 90,291,815 62,774,693
Basic and diluted net increase in net assets per share resulting from operations $ 0.19 $ 0.25 $ 0.54 [1] $ 1.12 [1]
[1] Based on the weighted average shares outstanding for the respective periods.