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Taxes and Distributions - Summary of Tax Characteristics of Distributions Declared (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]          
Ordinary income (including short-term gains, if any) $ 60,451 $ 46,685 $ 44,207    
Total distributions $ 60,451 $ 46,685 $ 44,207    
Total distributions per share based on weighted average shares [1],[2] $ 1.19 $ 1.14 $ 1.14 $ 1.14 $ 1.14
[1] Based on the weighted average shares outstanding for the respective periods.
[2] The tax status of distributions is calculated in accordance with income tax regulations, which may differ from amounts determined under GAAP, and reported on Form 1099-DIV each calendar year.