Quarterly report pursuant to Section 13 or 15(d)

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

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BORROWINGS - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Debt Instrument [Line Items]      
Line of credit at fair value (Cost of $61,500 and $70,600, respectively) $ 61,500   $ 70,600
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring      
Debt Instrument [Line Items]      
Line of credit at fair value (Cost of $61,500 and $70,600, respectively) 61,500   $ 70,600
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 70,600 $ 47,800  
Borrowings 87,500 70,200  
Repayments (96,600) (33,000)  
Net unrealized appreciation 0 0  
Ending balance $ 61,500 $ 85,000