Taxes and Distributions - Summary of Amounts Reclassified for Tax Purposes (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2023 |
|
| Income Tax Disclosure [Abstract] | |||
| Increase (Decrease) in paid-in capital | $ (3,462) | $ (2,800) | $ (1,703) |
| Increase (Decrease) in accumulated net realized gain | 68 | (11,993) | (1,494) |
| Increase in undistributed net investment income | $ 3,394 | $ 14,793 | $ 3,197 |