Annual report pursuant to Section 13 and 15(d)

DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details)

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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
USD ($)
distribution
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2022
Dec. 31, 2021
Equity [Abstract]          
Number of monthly distributions | distribution 3        
Investment company, cash distributions paid to common stockholders from ordinary income       93.20% 100.00%
Investment company, cash distributions paid to common stockholders from capital gains       6.80%  
Cash distributions to common stockholders $ 35,400 $ 27,300      
Undistributed ordinary income 4,978 0      
Tax return of capital distribution [1] 0 1,406 $ 985    
Capital loss carryforward $ 54,425 $ 62,910      
[1] Refer to Note 9 – Distributions to Common Stockholders in the accompanying Notes to Consolidated Financial Statements for additional information.