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
Dec. 31, 2022
Dec. 31, 2021
Total    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 643,160 $ 551,047
New investments, repayments and settlements:    
Issuances/originations 12,157 111,873
Settlements/repayments (25,549) (79,477)
Net proceeds from sales (7,978) (17,052)
Transfers 0 0
Ending balance 619,194 570,028
Total | Debt and Equity Securities, Realized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gain (loss) 4,900 13,876
Total | Debt and Equity Securities, Unrealized Gain (Loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Total gain (loss) (2,699) 4,969
Reversal of prior period net depreciation (appreciation) on realization (4,797) (15,208)
Secured first lien debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 463,858 337,394
New investments, repayments and settlements:    
Issuances/originations 11,475 74,703
Settlements/repayments (24,738) (20,742)
Net proceeds from sales 0 0
Transfers 0 0
Ending balance 450,243 395,753
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 0
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) (455) 4,493
Reversal of prior period net depreciation (appreciation) on realization 103 (95)
Secured second lien debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 115,928 135,956
New investments, repayments and settlements:    
Issuances/originations 182 30,170
Settlements/repayments (811) (58,735)
Net proceeds from sales 0 0
Transfers 0 0
Ending balance 114,755 106,232
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
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) (544) 559
Reversal of prior period net depreciation (appreciation) on realization 0 (1,718)
Unsecured debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 55 10
New investments, repayments and settlements:    
Issuances/originations 0 0
Settlements/repayments 0 0
Net proceeds from sales 0 0
Transfers 0 0
Ending balance 45 66
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) (95) 0
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) (10) 56
Reversal of prior period net depreciation (appreciation) on realization 95 0
Preferred Equity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 27,046 29,246
New investments, repayments and settlements:    
Issuances/originations 0 3,500
Settlements/repayments 0 0
Net proceeds from sales 0 (1,321)
Transfers 0 0
Ending balance 26,140 26,483
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) 0 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) (906) (661)
Reversal of prior period net depreciation (appreciation) on realization 0 (4,281)
Common Equity/ Equivalents    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 36,273 48,441
New investments, repayments and settlements:    
Issuances/originations 500 3,500
Settlements/repayments 0 0
Net proceeds from sales (7,978) (15,731)
Transfers 0 0
Ending balance 28,011 41,494
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) 4,995 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) (784) 522
Reversal of prior period net depreciation (appreciation) on realization $ (4,995) $ (9,114)