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 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Debt Instrument [Line Items]          
Credit Facility $ 163,800   $ 163,800   $ 141,800
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring          
Debt Instrument [Line Items]          
Credit Facility 163,800   163,800   $ 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 152,439 $ 17,400 141,800 $ 50,500  
Borrowings 22,600 74,000 123,000 235,500  
Repayments (11,400) (11,400) (101,000) (206,000)  
Net unrealized depreciation 161 0 0 0  
Ending balance $ 163,800 $ 80,000 $ 163,800 $ 80,000