Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

v3.23.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2023
USD ($)
loan
investment
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
loan
investment
Jun. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
investment
loan
Summary of Investment Holdings [Line Items]          
Cost $ 735,182,000   $ 735,182,000   $ 656,053,000
Fair Value 715,324,000   715,324,000   649,615,000
Total interest income (excluding PIK interest income) 20,971,000 $ 11,948,000 57,143,000 $ 35,725,000  
PIK interest income 845,000 645,000 2,618,000 2,696,000  
OID          
Summary of Investment Holdings [Line Items]          
Fair Value $ 800,000   $ 800,000   $ 900,000
Number of loans | loan 4   4   4
Total interest income (excluding PIK interest income) $ 49,000 46,000 $ 200,000 200,000  
PIK          
Summary of Investment Holdings [Line Items]          
Number of investments | investment 8   8   6
Proceeds from interest received $ 0 $ 0 $ 400,000 $ 2,400,000  
Edge Adhesives Holdings, Inc.          
Summary of Investment Holdings [Line Items]          
Cost $ 6,100,000   $ 6,100,000   $ 0
Cost percentage 0.90%   0.90%    
Fair Value $ 2,800,000   $ 2,800,000   $ 0
Fair value percentage 0.40%   0.40%