Quarterly report [Sections 13 or 15(d)]

NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE (Details)

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NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Earnings Per Share [Abstract]        
Numerator for basic net increase (decrease) in net assets resulting from operations per common share $ 13,270 $ 7,448 $ 34,183 $ 43,220
Denominator basic weighted average common share (in shares) 22,593,069 22,329,852 22,593,069 22,323,668
Basic net increase (decrease) in net assets resulting from operations per common share (in USD per share) $ 0.59 $ 0.33 $ 1.51 $ 1.93
Adjustment for interest and amortization on 2030 Convertible Notes $ 2,530 $ 0 $ 7,588 $ 0
Numerator for diluted net increase (decrease) in net assets resulting from operations per common share $ 15,800 $ 7,448 $ 41,771 $ 43,220
Adjustment for dilutive effect of 2030 Convertible Notes (in shares) 5,771,806 0 5,771,806 0
Denominator for diluted weighted average common shares (in shares) 28,364,875 22,329,852 28,364,875 22,323,668
Diluted net increase (decrease) in net assets resulting from operations per common share (in USD per share) $ 0.56 $ 0.33 $ 1.47 $ 1.93