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, 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)