Annual report pursuant to Section 13 and 15(d)

BORROWINGS - Schedule of Line of Credit Facilities (Details)

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BORROWINGS - Schedule of Line of Credit Facilities (Details) - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
May 13, 2022
May 12, 2022
Debt Instrument [Line Items]          
Borrowings outstanding, at cost $ 47,800,000 $ 141,800,000      
Credit Facility | Revolving Line of Credit | Line of Credit          
Debt Instrument [Line Items]          
Commitment amount 223,659,000 225,000,000   $ 175,000,000 $ 205,000,000
Borrowings outstanding, at cost 47,800,000 141,800,000      
Availability 169,060,000 60,068,000      
Weighted average borrowings outstanding, at cost $ 133,692,000 $ 56,122,000 $ 59,382,000    
Weighted average interest rate 8.00% 6.10% 5.00%    
Commitment (unused) fees incurred $ 624,000 $ 1,105,000 $ 1,194,000