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, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Total        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 619,194 $ 570,028 $ 643,160 $ 551,047
New investments, repayments and settlements:        
Issuances/originations 64,848 12,311 77,005 124,184
Settlements/repayments (9,342) (50,442) (34,891) (129,919)
Net proceeds from sales (654) (1) (8,632) (17,053)
Transfers 0 0 0 0
Ending balance 676,163 532,663 676,163 532,663
Total | Debt and Equity Securities, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total gain (loss) 403 0 5,303 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) 1,607 934 (1,092) 5,903
Reversal of prior period net depreciation (appreciation) on realization 107 (167) (4,690) (15,375)
Secured first lien debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 450,243 395,753 463,858 337,394
New investments, repayments and settlements:        
Issuances/originations 58,385 12,120 69,860 86,823
Settlements/repayments (7,646) (29,605) (32,384) (50,347)
Net proceeds from sales 0 0 0 0
Transfers 0 0 0 0
Ending balance 498,947 377,902 498,947 377,902
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) (107) 0 (107) 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) (2,035) (81) (2,490) 4,412
Reversal of prior period net depreciation (appreciation) on realization 107 (285) 210 (380)
Secured second lien debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 114,755 106,232 115,928 135,956
New investments, repayments and settlements:        
Issuances/originations 4,060 166 4,242 30,336
Settlements/repayments (1,696) (20,837) (2,507) (79,572)
Net proceeds from sales 0 0 0 0
Transfers 0 0 0 0
Ending balance 117,438 85,498 117,438 85,498
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) 319 (180) (225) 379
Reversal of prior period net depreciation (appreciation) on realization 0 117 0 (1,601)
Unsecured debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 45 66 55 10
New investments, repayments and settlements:        
Issuances/originations 0 25 0 25
Settlements/repayments 0 0 0 0
Net proceeds from sales 0 0 0 0
Transfers 0 0 0 0
Ending balance 36 64 36 64
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 0 (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) (9) (27) (19) 29
Reversal of prior period net depreciation (appreciation) on realization 0 0 95 0
Preferred Equity        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 26,140 26,483 27,046 29,246
New investments, repayments and settlements:        
Issuances/originations 371 0 371 3,500
Settlements/repayments 0 0 0 0
Net proceeds from sales (654) 0 (654) (1,321)
Transfers 0 0 0 0
Ending balance 28,298 27,935 28,298 27,935
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) 510 0 510 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) 1,931 1,452 1,025 791
Reversal of prior period net depreciation (appreciation) on realization 0 0 0 (4,281)
Common Equity/ Equivalents        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 28,011 41,494 36,273 48,441
New investments, repayments and settlements:        
Issuances/originations 2,032 0 2,532 3,500
Settlements/repayments 0 0 0 0
Net proceeds from sales 0 (1) (7,978) (15,732)
Transfers 0 0 0 0
Ending balance 31,444 41,264 31,444 41,264
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) 0 0 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) 1,401 (230) 617 292
Reversal of prior period net depreciation (appreciation) on realization $ 0 $ 1 $ (4,995) $ (9,113)