Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

v3.23.3
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
USD ($)
investment
loan
Sep. 30, 2022
USD ($)
investment
loan
Sep. 30, 2021
USD ($)
Summary of Investment Holdings [Line Items]      
Cost $ 722,269 [1] $ 656,053 [2]  
Fair Value 704,815 [1] 649,615 [2]  
Total interest income (excluding PIK interest income) 79,480 49,759 $ 47,414
PIK interest income $ 3,550 4,229 2,545
Investment company, target percentage of taxable income to distribute to shareholders (up to) 100.00%    
Edge Adhesives Holdings, Inc.      
Summary of Investment Holdings [Line Items]      
Cost $ 6,100    
Cost percentage 0.90%    
Fair Value $ 2,900    
Fair value percentage 0.50%    
OID      
Summary of Investment Holdings [Line Items]      
Fair Value $ 700 $ 900  
Number of loans | loan 4 4  
Total interest income (excluding PIK interest income) $ 200 $ 500 300
PIK      
Summary of Investment Holdings [Line Items]      
Number of investments | investment 8 6  
Proceeds from interest received $ 1,100 $ 2,400 $ 3,400
[1] Cumulative gross unrealized depreciation for federal income tax purposes is $56.9 million; cumulative gross unrealized appreciation for federal income tax purposes is $33.7 million. Cumulative net unrealized depreciation is $23.2 million, based on a tax cost of $728.0 million.
[2] Cumulative gross unrealized depreciation for federal income tax purposes is $52.3 million; cumulative gross unrealized appreciation for federal income tax purposes is $35.2 million. Cumulative net unrealized depreciation is $17.1 million, based on a tax cost of $666.7 million.