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BORROWINGS - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Debt Instrument [Line Items] |  |
Credit Facility | $ 70,600 | $ 47,800
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring |  |
Debt Instrument [Line Items] |  |
Credit Facility | 70,600 | 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 | 47,800 | 141,800
Borrowings | 221,200 | 149,000
Repayments | (198,400) | (243,000)
Net unrealized (appreciation) depreciation | 0 | 0
Ending balance | $ 70,600 | $ 47,800

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