Quarterly report [Sections 13 or 15(d)]

BORROWINGS - Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details)

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BORROWINGS - Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2025
Debt Instrument [Line Items]          
Credit Facility $ 199,800   $ 199,800   $ 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring          
Debt Instrument [Line Items]          
Credit Facility 199,800   199,800   $ 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Long-Term Debt          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Beginning balance 213,200 $ 61,500 0 $ 70,600  
Borrowings 50,200 61,000 284,000 148,500  
Repayments (63,600) (97,400) (84,200) (194,000)  
Net unrealized appreciation 0 49 0 49  
Ending balance $ 199,800 $ 25,149 $ 199,800 $ 25,149