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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Debt Instrument [Line Items]          
Credit Facility $ 65,800   $ 65,800   $ 47,800
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring          
Debt Instrument [Line Items]          
Credit Facility 65,800   65,800   $ 47,800
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 117,200 $ 152,439 47,800 $ 141,800  
Borrowings 45,200 22,600 179,500 123,000  
Repayments (96,600) (11,400) (161,500) (101,000)  
Net unrealized depreciation 0 161 0 0  
Ending balance $ 65,800 $ 163,800 $ 65,800 $ 163,800