v3.25.4
Consolidated Statements of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Statement of Stockholders' Equity [Abstract]      
Net investment income $ 46,051 $ 60,070 $ 65,533
Net realized gain (loss) on investments and debt (52,460) (33,833) (151,805)
Net change in unrealized appreciation (depreciation) on investments 39,225 27,493 59,594
Net change in provision for taxes on realized gain (loss) on investments 26 186 (4,952)
Net change in provision for taxes on change in unrealized appreciation (depreciation) on investments 0 (680) 1,576
Net change in unrealized (appreciation) depreciation on debt (116) (4,385) (3,753)
Net increase (decrease) in net assets resulting from operations 32,726 48,851 (33,807)
Distributions to stockholders:      
Distribution of net investment income (62,684) (57,432) (49,571)
Total distributios to stockholders (62,684) (57,432) (49,571)
Capital transactions:      
Net increase in net assets resulting from capital transactions 0 302 0
Proceeds from public offering 0 552 0
Offering costs 0 (250) 0
Net increase (decrease) in net assets (29,958) (8,279) (83,378)
Net assets:      
Beginning of year 493,908 502,187 585,565
End of year $ 463,950 $ 493,908 $ 502,187
Capital share activity:      
Shares of common stock issued from public offering 0 71,594 0
Shares of common stock repurchased 0 0 0