Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

v3.23.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2023
USD ($)
loan
investment
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
loan
investment
Mar. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
investment
loan
Summary of Investment Holdings [Line Items]          
Cost $ 696,031,000   $ 696,031,000   $ 656,053,000
Fair Value 678,759,000   678,759,000   649,615,000
Total interest income (excluding PIK interest income) 18,803,000 $ 12,048,000 36,172,000 $ 23,777,000  
PIK interest income 775,000 914,000 1,773,000 2,051,000  
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) $ 59,000 87,000 $ 100,000 200,000  
PIK          
Summary of Investment Holdings [Line Items]          
Number of investments | investment 7   7   6
Proceeds from interest received $ 0 $ 2,400,000 $ 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 1.00%   1.00%    
Fair Value $ 2,800,000   $ 2,800,000   $ 0
Fair value percentage 0.50%   0.50%