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, 2022
Dec. 31, 2021
Sep. 30, 2022
Debt Instrument [Line Items]      
Line of credit at fair value (Cost of $108,400 and $141,800, respectively) $ 108,400   $ 141,800
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring      
Debt Instrument [Line Items]      
Line of credit at fair value (Cost of $108,400 and $141,800, respectively) 108,400   $ 141,800
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 141,800 $ 50,500  
Borrowings 14,800 138,200  
Repayments (48,200) (134,800)  
Net unrealized appreciation 0 0  
Ending balance $ 108,400 $ 53,900