DISTRIBUTIONS TO COMMON STOCKHOLDERS - Schedule of Adjustments for Permanent Book-tax Differences to Reflect Tax Character (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Equity [Abstract]
Undistributed net investment income	$ (946)	$ (1,299)
Accumulated net realized losses	1,053	1,310
Capital in excess of par value	$ (107)	$ (11)