Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details)

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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)