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, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Numerator: basic and diluted net increase (decrease) in net assets resulting from operations per common share	$ 23,632	$ 11,986	$ 43,633	$ 17,684
Denominator: basic weighted average common share (in shares)	43,508,897	36,604,182	43,508,897	35,898,020
Denominator: diluted weighted average common share (in shares)	43,508,897	36,604,182	43,508,897	35,898,020
Basic net increase (decrease) in net assets resulting from operations (in USD per share)	$ 0.54	$ 0.33	$ 1.00	$ 0.49
Diluted net increase (decrease) in net assets resulting from operations (in USD per share)	$ 0.54	$ 0.33	$ 1.00	$ 0.49