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 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Earnings Per Share [Abstract]        
Numerator for basic net increase (decrease) in net assets resulting from operations per common share $ 15,459 $ 8,797 $ 20,913 $ 35,772
Denominator basic weighted average common share (in shares) 22,593,069 22,329,852 22,593,069 22,320,576
Basic net increase (decrease) in net assets resulting from operations per common share (in USD per share) $ 0.68 $ 0.39 $ 0.92 $ 1.60
Adjustment for interest and amortization on 2030 Convertible Notes $ 2,529 $ 0 $ 5,058 $ 0
Numerator for diluted net increase (decrease) in net assets resulting from operations per common share $ 17,988 $ 8,797 $ 25,971 $ 35,772
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 22,320,576
Diluted net increase (decrease) in net assets resulting from operations per common share (in USD per share) $ 0.63 $ 0.39 $ 0.92 $ 1.60