NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS PER WEIGHTED AVERAGE COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Numerator: basic and diluted net increase (decrease) in net assets resulting from operations per common share	$ 11,986	$ 8,303	$ 17,684	$ 20,406
Denominator: basic weighted average common share (in shares)	36,604,182	34,304,371	35,898,020	34,304,371
Denominator: diluted weighted average common share (in shares)	36,604,182	34,304,371	35,898,020	34,304,371
Basic net increase (decrease) in net assets resulting from operations (in USD per share)	$ 0.33	$ 0.24	$ 0.49	$ 0.59
Diluted net increase (decrease) in net assets resulting from operations (in USD per share)	$ 0.33	$ 0.24	$ 0.49	$ 0.59