v3.25.4

Taxes and Distributions - Summary of Reconciles Net (Decrease) Increase in Net Assets Resulting From Operations to Taxable Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Income Tax Disclosure [Abstract] |  |  |
Net increase (decrease) in net assets resulting from operations | $ 32,725 | $ 48,852 | $ (33,807)
Net realized (gain) loss on investments | 52,434 | 33,646 | 156,757
Net change in unrealized (appreciation) depreciation on investments and debt | (39,108) | (22,428) | (57,417)
Other book-to-tax differences | (1,551) | 9,268 | (6,006)
Other non-deductible expenses | 3,372 | 3,245 | 5,766
Taxable income before dividends paid deduction | $ 47,872 | $ 72,583 | $ 65,293

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