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Consolidated Statements of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest [Abstract]      
Net investment income $ 107,154 $ 77,721 $ 67,491
Net realized gain (loss) on investments (5,941) 222 (15,892)
Net realized loss on debt extinguishment (0) (383) 0
Net change in unrealized (appreciation) depreciation on debt (34,634) 14,268 (12,565)
Net change in provision for taxes on realized and unrealized appreciation (depreciation) on investments (257) 37 2,511
Net change in unrealized appreciation (depreciation) on debt 43 (26) (2,284)
Net increase in net assets resulting from operations 66,365 91,839 39,261
Distributions to stockholders:      
Distribution of net investment income (113,897) (80,627) (60,451)
Total distributions to stockholders (113,897) (80,627) (60,451)
Capital Transactions [Abstract]      
Public offering 245,479 213,910 148,408
Offering costs (725) (1,433) (705)
Net increase in net assets resulting from capital transactions 244,754 212,477 147,703
Net increase (decrease) in net assets 197,222 223,689 126,513
Net assets:      
Beginning of year 877,294 653,605 527,092
End of year $ 1,074,516 $ 877,294 $ 653,605
Capital share activity:      
Shares issued from public offering 21,638,000 18,845,194 13,389,064