Quarterly report [Sections 13 or 15(d)]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 3 Months Ended
Jun. 30, 2026
USD ($)
segment
Mar. 31, 2026
USD ($)
Summary of Investment Holdings [Line Items]    
Cost $ 1,044,448 $ 1,052,848 [1]
Fair Value $ 1,282,020 1,309,248 [1]
Number of reportable segments | segment 1  
B+T Group Acquisition, Inc. ("B+T"), Diligent Delivery Systems ("Diligent") and Edge Adhesives Holdings, Inc. ("Edge")    
Summary of Investment Holdings [Line Items]    
Cost $ 40,300  
Cost percentage 5.50%  
Fair Value $ 12,200  
Fair value percentage 1.80%  
B+T, Diligent, Edge and J.R. Hobbs Co. – Atlanta, LLC (“J.R. Hobbs”)    
Summary of Investment Holdings [Line Items]    
Cost   $ 40,300
Cost percentage   5.40%
Fair Value   $ 9,100
Fair value percentage   1.40%
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $428.5 million; cumulative gross unrealized depreciation for federal income tax purposes is $173.7 million. Cumulative net unrealized appreciation is $254.8 million, based on a tax cost of $1.1 billion.