v3.26.1
Consolidated Statements of Changes in Net Assets (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Investment Company, Net Assets [Roll Forward]        
Beginning balance (in shares)     71,236,992.933  
Beginning balance $ 1,212,389 $ 835,546 $ 1,068,555 $ 650,202
Issuance of common stock (in shares)     9,838,447.324 22,182,337.103
Issuance of common stock   155,827 $ 147,577 $ 332,735
Net increase (decrease) in net assets resulting from operations:        
Net investment income 30,827 23,121 91,233 62,342
Net realized gain (loss) on investment transactions 1,180 (214) 1,674 67
Net change in unrealized appreciation (depreciation) on investment transactions 198 709 $ (36,001) $ 3,762
Distributions to stockholders:        
Stock issued in connection with dividend reinvestment plan (in shares)     788,565.652 868,603.934
Stock issued in connection with dividend reinvestment plan   4,594 $ 11,829 $ 13,030
Distributions from distributable earnings (losses)   (6,968) (40,273) (49,523)
Distributions declared and payable (16,633) (16,648) (16,633) (16,648)
Total increase (decrease) common stock, outstanding value $ 15,572 $ 160,421 $ 159,406 $ 345,765
Ending balance (in shares) 81,864,005.909 66,397,771.207 81,864,005.909 66,397,771.207
Ending balance $ 1,227,961 $ 995,967 $ 1,227,961 $ 995,967
Common Stock        
Investment Company, Net Assets [Roll Forward]        
Beginning balance (in shares) 81,864,005.909 55,703,115.572 71,236,992.933 43,346,830.17
Beginning balance $ 82 $ 56 $ 71 $ 43
Issuance of common stock (in shares)   10,388,413.154 9,838,447.324 22,182,337.103
Issuance of common stock   $ 10 $ 10 $ 22
Distributions to stockholders:        
Stock issued in connection with dividend reinvestment plan (in shares)   306,242.481 788,565.652 868,603.934
Stock issued in connection with dividend reinvestment plan   $ 0 $ 1 $ 1
Total increase (decrease) common stock, outstanding (in shares) 0 10,694,655.635 10,627,012.976 23,050,941.037
Total increase (decrease) common stock, outstanding value $ 0 $ 10 $ 11 $ 23
Ending balance (in shares) 81,864,005.909 66,397,771.207 81,864,005.909 66,397,771.207
Ending balance $ 82 $ 66 $ 82 $ 66
Paid in Capital in Excess of Par        
Investment Company, Net Assets [Roll Forward]        
Beginning balance 1,227,504 835,184 1,068,109 649,853
Issuance of common stock   155,817 147,567 332,713
Distributions to stockholders:        
Stock issued in connection with dividend reinvestment plan   4,594 11,828 13,029
Total increase (decrease) common stock, outstanding value 0 160,411 159,395 345,742
Ending balance 1,227,504 995,595 1,227,504 995,595
Distributable Earnings (Losses)        
Investment Company, Net Assets [Roll Forward]        
Beginning balance (15,197) 306 375 306
Net increase (decrease) in net assets resulting from operations:        
Net investment income 30,827 23,121 91,233 62,342
Net realized gain (loss) on investment transactions 1,180 (214) 1,674 67
Net change in unrealized appreciation (depreciation) on investment transactions 198 709 (36,001) 3,762
Distributions to stockholders:        
Distributions from distributable earnings (losses)   (6,968) (40,273) (49,523)
Distributions declared and payable (16,633) (16,648) (16,633) (16,648)
Total increase (decrease) common stock, outstanding value 15,572 0 0 0
Ending balance $ 375 $ 306 $ 375 $ 306