Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

v3.24.2.u1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 05, 2024
Apr. 04, 2024
Jun. 30, 2024
USD ($)
loan
investment
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
loan
investment
Jun. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
investment
loan
Summary of Investment Holdings [Line Items]              
Reverse stock split, conversion ratio 0.5 0.5          
Cost     $ 753,263   $ 753,263   $ 722,269 [1]
Investments, at fair value     757,745   757,745   704,815 [1]
Total interest income (excluding PIK interest income)     21,715 $ 20,971 65,633 $ 57,143  
PIK interest income     1,484 845 4,277 2,618  
OID              
Summary of Investment Holdings [Line Items]              
Investments, at fair value     $ 800   $ 800   $ 700
Number of loans | loan     3   3   4
Total interest income (excluding PIK interest income)     $ 100 49 $ 200 200  
PIK              
Summary of Investment Holdings [Line Items]              
Number of investments | investment     11   11   8
Proceeds from interest received     $ 200 $ 0 $ 200 $ 400  
B+T Group Acquisition, Inc., Edge Adhesives Holdings, Inc,. and WB Xcel Holdings, LLC              
Summary of Investment Holdings [Line Items]              
Cost     $ 26,400   $ 26,400    
Cost percentage     3.90%   3.90%    
Investments, at fair value     $ 13,900   $ 13,900    
Fair value percentage     2.10%   2.10%    
Edge Adhesives Holdings, Inc.              
Summary of Investment Holdings [Line Items]              
Cost             $ 6,100
Cost percentage             0.90%
Investments, at fair value             $ 2,900
Fair value percentage             0.50%
[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.