Quarterly report [Sections 13 or 15(d)]

BORROWINGS - Schedule of Line of Credit Facilities (Details)

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BORROWINGS - Schedule of Line of Credit Facilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Debt Instrument [Line Items]          
Line of credit outstanding, at cost $ 177,500   $ 177,500   $ 0
Credit Facility | Revolving Line of Credit | Line of Credit          
Debt Instrument [Line Items]          
Commitment amount 365,000   365,000   320,000
Line of credit outstanding, at cost 177,500   177,500   0
Availability 172,467   172,467   $ 307,467
Weighted average borrowings outstanding, at cost $ 206,057 $ 6,558 $ 170,305 $ 28,711  
Weighted average interest rate 6.80% 58.30% 7.10% 17.30%  
Commitment (unused) fees incurred $ 241 $ 724 $ 918 $ 2,013