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INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Total |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 704,562 | $ 643,160
New investments, repayments and settlements: |  |
Issuances/originations | 59,209 | 12,157
Settlements/repayments | (21,843) | (25,549)
Net proceeds from sales | (260) | (7,978)
Transfers | 0 | 0
Ending balance | 749,717 | 619,194
Total | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 259 | 4,900
Total | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 8,073 | (2,699)
Reversal of prior period net depreciation (appreciation) on realization | (283) | (4,797)
Secured first lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 510,701 | 463,858
New investments, repayments and settlements: |  |
Issuances/originations | 50,024 | 11,475
Settlements/repayments | (21,119) | (24,738)
Net proceeds from sales | 0 | 0
Transfers | 0 | 0
Ending balance | 546,602 | 450,243
Secured first lien debt | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 0 | 0
Secured first lien debt | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 6,996 | (455)
Reversal of prior period net depreciation (appreciation) on realization | 0 | 103
Secured second lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 127,854 | 115,928
New investments, repayments and settlements: |  |
Issuances/originations | 185 | 182
Settlements/repayments | (724) | (811)
Net proceeds from sales | 0 | 0
Transfers | 0 | 0
Ending balance | 126,571 | 114,755
Secured second lien debt | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 0 | 0
Secured second lien debt | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | (744) | (544)
Reversal of prior period net depreciation (appreciation) on realization | 0 | 0
Unsecured debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 24 | 55
New investments, repayments and settlements: |  |
Issuances/originations | 0 | 0
Settlements/repayments | 0 | 0
Net proceeds from sales | 0 | 0
Transfers | 0 | 0
Ending balance | 23 | 45
Unsecured debt | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 0 | (95)
Unsecured debt | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | (1) | (10)
Reversal of prior period net depreciation (appreciation) on realization | 0 | 95
Preferred Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 26,855 | 27,046
New investments, repayments and settlements: |  |
Issuances/originations | 9,000 | 0
Settlements/repayments | 0 | 0
Net proceeds from sales | 0 | 0
Transfers | 0 | 0
Ending balance | 29,722 | 26,140
Preferred Equity | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 0 | 0
Preferred Equity | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | (6,133) | (906)
Reversal of prior period net depreciation (appreciation) on realization | 0 | 0
Common Equity/ Equivalents |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 39,128 | 36,273
New investments, repayments and settlements: |  |
Issuances/originations | 0 | 500
Settlements/repayments | 0 | 0
Net proceeds from sales | (260) | (7,978)
Transfers | 0 | 0
Ending balance | 46,799 | 28,011
Common Equity/ Equivalents | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 259 | 4,995
Common Equity/ Equivalents | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 7,955 | (784)
Reversal of prior period net depreciation (appreciation) on realization | $ (283) | $ (4,995)

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