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INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Total |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 643,160 | $ 551,047
New investments, repayments and settlements: |  |
Issuances/originations | 12,157 | 111,873
Settlements/repayments | (25,549) | (79,477)
Net proceeds from sales | (7,978) | (17,052)
Transfers | 0 | 0
Ending balance | 619,194 | 570,028
Total | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 4,900 | 13,876
Total | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | (2,699) | 4,969
Reversal of prior period net depreciation (appreciation) on realization | (4,797) | (15,208)
Secured first lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 463,858 | 337,394
New investments, repayments and settlements: |  |
Issuances/originations | 11,475 | 74,703
Settlements/repayments | (24,738) | (20,742)
Net proceeds from sales | 0 | 0
Transfers | 0 | 0
Ending balance | 450,243 | 395,753
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) | (455) | 4,493
Reversal of prior period net depreciation (appreciation) on realization | 103 | (95)
Secured second lien debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 115,928 | 135,956
New investments, repayments and settlements: |  |
Issuances/originations | 182 | 30,170
Settlements/repayments | (811) | (58,735)
Net proceeds from sales | 0 | 0
Transfers | 0 | 0
Ending balance | 114,755 | 106,232
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) | (544) | 559
Reversal of prior period net depreciation (appreciation) on realization | 0 | (1,718)
Unsecured debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 55 | 10
New investments, repayments and settlements: |  |
Issuances/originations | 0 | 0
Settlements/repayments | 0 | 0
Net proceeds from sales | 0 | 0
Transfers | 0 | 0
Ending balance | 45 | 66
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) | (95) | 0
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) | (10) | 56
Reversal of prior period net depreciation (appreciation) on realization | 95 | 0
Preferred Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 27,046 | 29,246
New investments, repayments and settlements: |  |
Issuances/originations | 0 | 3,500
Settlements/repayments | 0 | 0
Net proceeds from sales | 0 | (1,321)
Transfers | 0 | 0
Ending balance | 26,140 | 26,483
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) | (906) | (661)
Reversal of prior period net depreciation (appreciation) on realization | 0 | (4,281)
Common Equity/ Equivalents |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 36,273 | 48,441
New investments, repayments and settlements: |  |
Issuances/originations | 500 | 3,500
Settlements/repayments | 0 | 0
Net proceeds from sales | (7,978) | (15,731)
Transfers | 0 | 0
Ending balance | 28,011 | 41,494
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) | 4,995 | 13,876
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) | (784) | 522
Reversal of prior period net depreciation (appreciation) on realization | $ (4,995) | $ (9,114)

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