Annual report pursuant to Section 13 and 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
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Debt Instrument [Line Items]    
Credit Facility $ 47,800 $ 141,800
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Debt Instrument [Line Items]    
Credit Facility 47,800 141,800
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 149,000 328,900
Repayments (243,000) (237,600)
Net unrealized appreciation (depreciation) 0 0
Ending balance $ 47,800 $ 141,800