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INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Total |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 676,163 | $ 532,663 | $ 643,160 | $ 551,047
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 71,442 | 67,885 | 148,447 | 192,069
Settlements/repayments | (29,086) | (7,572) | (63,977) | (137,491)
Net proceeds from sales | (3,700) | 1,339 | (12,332) | (15,714)
Transfers | 0 | 0 | 0 | 0
Ending balance | 715,100 | 580,900 | 715,100 | 580,900
Total | Debt and Equity Securities, Realized Gain (Loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | 2,911 | (8,496) | 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) | 1,306 | (19,115) | 214 | (13,212)
Reversal of prior period net depreciation (appreciation) on realization | (3,936) | 14,196 | (8,626) | (1,179)
Secured first lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 498,947 | 377,902 | 463,858 | 337,394
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 65,707 | 64,578 | 135,567 | 151,401
Settlements/repayments | (29,022) | (6,509) | (61,406) | (56,856)
Net proceeds from sales | 0 | 1,339 | 0 | 1,339
Transfers | 0 | (6,750) | 0 | (6,750)
Ending balance | 533,237 | 433,106 | 533,237 | 433,106
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 | (8,471) | (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) | (2,195) | (3,182) | (4,685) | 1,230
Reversal of prior period net depreciation (appreciation) on realization | (200) | 14,199 | 10 | 13,819
Secured second lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 117,438 | 85,498 | 115,928 | 135,956
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 2,061 | 167 | 6,303 | 30,503
Settlements/repayments | (64) | (813) | (2,571) | (80,385)
Net proceeds from sales | 0 | 0 | 0 | 0
Transfers | 0 | 0 | 0 | 0
Ending balance | 120,036 | 83,846 | 120,036 | 83,846
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 | 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) | 601 | (1,006) | 376 | (627)
Reversal of prior period net depreciation (appreciation) on realization | 0 | 0 | 0 | (1,601)
Unsecured debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 36 | 64 | 55 | 10
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 0 | 0 | 0 | 25
Settlements/repayments | 0 | 0 | 0 | 0
Net proceeds from sales | 0 | 0 | 0 | 0
Transfers | 0 | 0 | 0 | 0
Ending balance | 32 | 59 | 32 | 59
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 | (25) | (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) | (4) | (5) | (23) | 24
Reversal of prior period net depreciation (appreciation) on realization | 0 | 25 | 95 | 25
Preferred Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 28,298 | 27,935 | 27,046 | 29,246
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 1,674 | 3,140 | 2,045 | 6,640
Settlements/repayments | 0 | (250) | 0 | (250)
Net proceeds from sales | 0 | 0 | (654) | (1,321)
Transfers | 0 | 0 | 0 | 0
Ending balance | 27,991 | 25,315 | 27,991 | 25,315
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) | (789) | 0 | (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) | (1,718) | (5,482) | (693) | (4,691)
Reversal of prior period net depreciation (appreciation) on realization | 526 | (28) | 526 | (4,309)
Common Equity/ Equivalents |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 31,444 | 41,264 | 36,273 | 48,441
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 2,000 | 0 | 4,532 | 3,500
Settlements/repayments | 0 | 0 | 0 | 0
Net proceeds from sales | (3,700) | 0 | (11,678) | (15,732)
Transfers | 0 | 6,750 | 0 | 6,750
Ending balance | 33,804 | 38,574 | 33,804 | 38,574
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) | 3,700 | 0 | 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) | 4,622 | (9,440) | 5,239 | (9,148)
Reversal of prior period net depreciation (appreciation) on realization | $ (4,262) | $ 0 | $ (9,257) | $ (9,113)

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