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INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
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 | 176,760 | 279,430
Settlements/repayments | (105,203) | (159,412)
Net proceeds from sales | (12,332) | (15,714)
Transfers | 0 | 0
Ending balance | 704,562 | 643,160
Total | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 8,214 | 5,380
Total | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gain (loss) | 1,743 | (16,540)
Reversal of prior period net depreciation (appreciation) on realization | (7,780) | (1,031)
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 | 154,762 | 204,970
Settlements/repayments | (101,085) | (77,898)
Net proceeds from sales | 0 | 1,339
Transfers | 0 | (6,750)
Ending balance | 510,701 | 463,858
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) | (107) | (8,471)
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) | (7,577) | (693)
Reversal of prior period net depreciation (appreciation) on realization | 850 | 13,967
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 | 15,421 | 62,570
Settlements/repayments | (4,118) | (81,264)
Net proceeds from sales | 0 | 0
Transfers | 0 | 0
Ending balance | 127,854 | 115,928
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) | 617 | 267
Reversal of prior period net depreciation (appreciation) on realization | 6 | (1,601)
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 | 25
Settlements/repayments | 0 | 0
Net proceeds from sales | 0 | 0
Transfers | 0 | 0
Ending balance | 24 | 55
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) | (25)
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) | (31) | 20
Reversal of prior period net depreciation (appreciation) on realization | 95 | 25
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 | 2,045 | 6,846
Settlements/repayments | 0 | (250)
Net proceeds from sales | (654) | (1,321)
Transfers | 0 | 0
Ending balance | 26,855 | 27,046
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) | (279) | 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) | (1,829) | (3,166)
Reversal of prior period net depreciation (appreciation) on realization | 526 | (4,309)
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 | 4,532 | 5,019
Settlements/repayments | 0 | 0
Net proceeds from sales | (11,678) | (15,732)
Transfers | 0 | 6,750
Ending balance | 39,128 | 36,273
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) | 8,695 | 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) | 10,563 | (12,968)
Reversal of prior period net depreciation (appreciation) on realization | $ (9,257) | $ (9,113)

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