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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
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]          
Net increase in net assets resulting from operations $ 91,839 $ 39,261 $ 3,453    
Denominator for basic weighted average shares 65,725,197 50,832,980 41,060,541    
Denominator for diluted weighted average shares 65,725,197 50,832,980 41,060,541    
Basic and diluted net increase in net assets per share resulting from operations [1] $ 1.4 $ 0.77 $ 0.08 $ 1.46 $ 0.47
[1] Based on the weighted average shares outstanding for the respective periods.