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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Total |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 791,324 | $ 676,163 | $ 704,562 | $ 643,160
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 47,846 | 71,442 | 153,183 | 148,447
Settlements/repayments | (85,084) | (29,086) | (121,397) | (63,977)
Net proceeds from sales | (1,434) | (3,700) | (2,663) | (12,332)
Transfers | 0 | 0 | 0 | 0
Ending balance | 757,535 | 715,100 | 757,535 | 715,100
Total | Net realized gain (loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | 1,415 | 2,911 | 1,893 | 8,214
Total | Net unrealized appreciation (depreciation) and Reversal of prior period net depreciation (appreciation) on realization |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | 3,559 | 1,306 | 22,063 | 214
Reversal of prior period net depreciation (appreciation) on realization | (91) | (3,936) | (106) | (8,626)
Secured first lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 563,849 | 498,947 | 510,701 | 463,858
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 26,964 | 65,707 | 106,939 | 135,567
Settlements/repayments | (41,749) | (29,022) | (73,555) | (61,406)
Net proceeds from sales | 50 | 0 | 50 | 0
Transfers | 0 | 0 | 0 | 0
Ending balance | 542,283 | 533,237 | 542,283 | 533,237
Secured first lien debt | Net realized gain (loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | (50) | 0 | (50) | (107)
Secured first lien debt | Net unrealized appreciation (depreciation) and Reversal of prior period net depreciation (appreciation) on realization |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | (6,748) | (2,195) | (1,750) | (4,685)
Reversal of prior period net depreciation (appreciation) on realization | (33) | (200) | (52) | 10
Secured second lien debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 140,409 | 117,438 | 127,854 | 115,928
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 20,132 | 2,061 | 35,494 | 6,303
Settlements/repayments | (43,335) | (64) | (47,842) | (2,571)
Net proceeds from sales | 0 | 0 | 0 | 0
Transfers | 0 | 0 | 0 | 0
Ending balance | 117,875 | 120,036 | 117,875 | 120,036
Secured second lien debt | Net 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 | Net unrealized appreciation (depreciation) and Reversal of prior period net depreciation (appreciation) on realization |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | 727 | 601 | 2,270 | 376
Reversal of prior period net depreciation (appreciation) on realization | (58) | 0 | 99 | 0
Unsecured debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 33 | 36 | 24 | 55
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 0 | 0 | 0 | 0
Settlements/repayments | 0 | 0 | 0 | 0
Net proceeds from sales | 0 | 0 | 0 | 0
Transfers | 0 | 0 | 0 | 0
Ending balance | 33 | 32 | 33 | 32
Unsecured debt | Net realized gain (loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | 0 | 0 | 0 | (95)
Unsecured debt | Net unrealized appreciation (depreciation) and Reversal of prior period net depreciation (appreciation) on realization |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | 0 | (4) | 9 | (23)
Reversal of prior period net depreciation (appreciation) on realization | 0 | 0 | 0 | 95
Preferred Equity |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 32,598 | 28,298 | 26,855 | 27,046
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 0 | 1,674 | 10,000 | 2,045
Settlements/repayments | 0 | 0 | 0 | 0
Net proceeds from sales | 0 | 0 | (969) | (654)
Transfers | 0 | 0 | 0 | 0
Ending balance | 32,965 | 27,991 | 32,965 | 27,991
Preferred Equity | Net realized gain (loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | 0 | (789) | 219 | (279)
Preferred Equity | Net unrealized appreciation (depreciation) and Reversal of prior period net depreciation (appreciation) on realization |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | 367 | (1,718) | (3,270) | (693)
Reversal of prior period net depreciation (appreciation) on realization | 0 | 526 | 130 | 526
Common Equity/ Equivalents |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 54,435 | 31,444 | 39,128 | 36,273
New investments, repayments and settlements: |  |  |  |
Issuances/originations | 750 | 2,000 | 750 | 4,532
Settlements/repayments | 0 | 0 | 0 | 0
Net proceeds from sales | (1,484) | (3,700) | (1,744) | (11,678)
Transfers | 0 | 0 | 0 | 0
Ending balance | 64,379 | 33,804 | 64,379 | 33,804
Common Equity/ Equivalents | Net realized gain (loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | 1,465 | 3,700 | 1,724 | 8,695
Common Equity/ Equivalents | Net unrealized appreciation (depreciation) and Reversal of prior period net depreciation (appreciation) on realization |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gain (loss) | 9,213 | 4,622 | 24,804 | 5,239
Reversal of prior period net depreciation (appreciation) on realization | $ 0 | $ (4,262) | $ (283) | $ (9,257)

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