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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 |

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