NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Numerator for basic and diluted net increase (decrease) in net assets resulting from operations per common share		$ 94,506	$ 42,668	$ 19,914
Denominator for basic weighted average common shares (in shares)	[1]	21,781,074	18,657,961	17,175,832
Denominator for diluted weighted average common shares (in shares)	[1]	21,781,074	18,657,961	17,175,832
Basic net increase (decrease) in net assets resulting from operations per common share (in USD per share)	[1]	$ 4.34	$ 2.29	$ 1.16
Diluted net increase (decrease) in net assets resulting from operations per common share (in USD per share)	[1]	$ 4.34	$ 2.29	$ 1.16

[1] Per share amounts and weighted average common shares outstanding have been adjusted on a retroactive basis to reflect the Reverse Stock Split effected on April 4, 2024. Refer to Note 2—Summary of Significant Accounting Policies for additional information.