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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]        
Net Income (Loss) $ 5,593 $ (5,085) $ 11,215 $ 16,592
Denominator for basic and diluted weighted average shares 50,799,353 41,334,234 48,220,835 39,940,832
Basic and diluted net increase in net assets per share resulting from operations $ 0.11 $ (0.12) $ 0.23 [1] $ 0.42 [1]
[1] Based on the weighted average shares outstanding for the respective periods.