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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, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]        
Net Income (Loss) $ 31,111 $ 7,243 $ 53,579 $ 5,623
Denominator for basic weighted average shares 61,151,898 48,529,037 59,936,696 46,931,577
Denominator for diluted weighted average shares 61,151,898 48,529,037 59,936,696 46,931,577
Basic and diluted net increase in net assets per share resulting from operations $ 0.51 $ 0.15 $ 0.89 [1] $ 0.12 [1]
[1] Based on the weighted average shares outstanding for the respective periods.