Annual report pursuant to Section 13 and 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
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Total    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 704,562 $ 643,160
New investments, repayments and settlements:    
Issuances/originations 183,175 176,760
Settlements/repayments (133,641) (105,203)
Net proceeds from sales (2,776) (12,332)
Transfers 0 0
Ending balance 796,222 704,562
Total | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gain (loss) 2,006 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) 43,124 1,743
Reversal of prior period net depreciation (appreciation) on realization (228) (7,780)
Secured First Lien Debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 510,701 463,858
New investments, repayments and settlements:    
Issuances/originations 131,462 154,762
Settlements/repayments (80,102) (101,085)
Net proceeds from sales 50 0
Transfers 0 0
Ending balance 554,937 510,701
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) (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) (7,071) (7,577)
Reversal of prior period net depreciation (appreciation) on realization (53) 850
Secured second lien debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 127,854 115,928
New investments, repayments and settlements:    
Issuances/originations 36,978 15,421
Settlements/repayments (53,539) (4,118)
Net proceeds from sales 0 0
Transfers 0 0
Ending balance 113,716 127,854
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
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) 2,445 617
Reversal of prior period net depreciation (appreciation) on realization (22) 6
Unsecured debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 24 55
New investments, repayments and settlements:    
Issuances/originations 0 0
Settlements/repayments 0 0
Net proceeds from sales 0 0
Transfers 0 0
Ending balance 32 24
Unsecured debt | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gain (loss) 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) 8 (31)
Reversal of prior period net depreciation (appreciation) on realization 0 95
Preferred equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 26,855 27,046
New investments, repayments and settlements:    
Issuances/originations 10,150 2,045
Settlements/repayments 0 0
Net proceeds from sales (1,082) (654)
Transfers 0 0
Ending balance 31,346 26,855
Preferred equity | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gain (loss) 332 (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) (5,039) (1,829)
Reversal of prior period net depreciation (appreciation) on realization 130 526
Common Equity/ Equivalents    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 39,128 36,273
New investments, repayments and settlements:    
Issuances/originations 4,585 4,532
Settlements/repayments 0 0
Net proceeds from sales (1,744) (11,678)
Transfers 0 0
Ending balance 96,191 39,128
Common Equity/ Equivalents | Net realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gain (loss) 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) 52,781 10,563
Reversal of prior period net depreciation (appreciation) on realization $ (283) $ (9,257)