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 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 749,717 $ 619,194 $ 704,562 $ 643,160
New investments, repayments and settlements:        
Issuances/originations 46,128 64,848 105,337 77,005
Settlements/repayments (14,470) (9,342) (36,313) (34,891)
Net proceeds from sales (969) (654) (1,229) (8,632)
Transfers 0 0 0 0
Ending balance 791,324 676,163 791,324 676,163
Total | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) 219 403 478 5,303
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) 10,431 1,607 18,504 (1,092)
Reversal of prior period net depreciation (appreciation) on realization 268 107 (15) (4,690)
Secured first lien debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 546,602 450,243 510,701 463,858
New investments, repayments and settlements:        
Issuances/originations 29,951 58,385 79,975 69,860
Settlements/repayments (10,687) (7,646) (31,806) (32,384)
Net proceeds from sales 0 0 0 0
Transfers 0 0 0 0
Ending balance 563,849 498,947 563,849 498,947
Secured first lien debt | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) 0 (107) 0 (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) (1,998) (2,035) 4,998 (2,490)
Reversal of prior period net depreciation (appreciation) on realization (19) 107 (19) 210
Secured second lien debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 126,571 114,755 127,854 115,928
New investments, repayments and settlements:        
Issuances/originations 15,177 4,060 15,362 4,242
Settlements/repayments (3,783) (1,696) (4,507) (2,507)
Net proceeds from sales 0 0 0 0
Transfers 0 0 0 0
Ending balance 140,409 117,438 140,409 117,438
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) 2,287 319 1,543 (225)
Reversal of prior period net depreciation (appreciation) on realization 157 0 157 0
Unsecured debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 23 45 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 36 33 36
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) 10 (9) 9 (19)
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 29,722 26,140 26,855 27,046
New investments, repayments and settlements:        
Issuances/originations 1,000 371 10,000 371
Settlements/repayments 0 0 0 0
Net proceeds from sales (969) (654) (969) (654)
Transfers 0 0 0 0
Ending balance 32,598 28,298 32,598 28,298
Preferred Equity | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) 219 510 219 510
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) 2,496 1,931 (3,637) 1,025
Reversal of prior period net depreciation (appreciation) on realization 130 0 130 0
Common Equity/ Equivalents        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 46,799 28,011 39,128 36,273
New investments, repayments and settlements:        
Issuances/originations 0 2,032 0 2,532
Settlements/repayments 0 0 0 0
Net proceeds from sales 0 0 (260) (7,978)
Transfers 0 0 0 0
Ending balance 54,435 31,444 54,435 31,444
Common Equity/ Equivalents | Net realized gain (loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) 0 0 259 4,995
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) 7,636 1,401 15,591 617
Reversal of prior period net depreciation (appreciation) on realization $ 0 $ 0 $ (283) $ (4,995)