Annual report pursuant to Section 13 and 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
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]      
Numerator for basic and diluted net increase (decrease) in net assets resulting from operations per common share $ 42,668 $ 19,914 $ 84,299
Denominator for basic weighted average common share (in shares) 37,315,922 34,351,663 33,234,482
Denominator for diluted weighted average common share (in shares) 37,315,922 34,351,663 33,234,482
Basic net increase (decrease) in net assets resulting from operations per common share (in USD per share) $ 1.14 $ 0.58 $ 2.54
Diluted net increase (decrease) in net assets resulting from operations per common share (in USD per share) $ 1.14 $ 0.58 $ 2.54