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 6 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
company
segment
Mar. 31, 2025
company
Jun. 30, 2025
Mar. 31, 2026
USD ($)
company
Dec. 31, 2025
USD ($)
Schedule of Investments [Line Items]          
Concentration risk, percentage (as a percent) 100.00%       100.00%
Cash equivalents $ 8,700     $ 8,700 $ 11,100
Cash balances exceeded federal deposit insurance corporation insurance protection levels 5,900     5,900 8,500
Investments at fair value: 1,369,202 [1],[2],[3]     1,369,202 [1],[2],[3] 1,335,387 [4]
Investment, cost $ 1,296,530 [1],[3],[5]     1,296,530 [1],[3],[5] 1,259,923 [6]
Percentage of total investment income, attributable to noncash paid-in-kind interest income (as a percent) 7.30% 5.80%      
Percentage of total investment income, attributable to noncash cumulative dividend income (as a percent) 0.80% 0.20%      
Percentage of total investment income, attributable to interest income, debt investments, net (as a percent) 2.60% 2.30%      
Number of reportable segments | segment 1        
Nonperforming Financial Instruments          
Schedule of Investments [Line Items]          
Investments at fair value: $ 15,100     15,100 13,700
Investment, cost $ 55,000     $ 55,000 $ 49,000
Investment Owned, At Fair Value | Investment Type Concentration Risk          
Schedule of Investments [Line Items]          
Concentration risk, percentage (as a percent) 100.00%   100.00%    
Investment Owned, At Fair Value | Investment Type Concentration Risk | Nonperforming Financial Instruments          
Schedule of Investments [Line Items]          
Concentration risk, percentage (as a percent) 1.10%       1.00%
Investment Owned, At Cost | Investment Type Concentration Risk          
Schedule of Investments [Line Items]          
Concentration risk, percentage (as a percent) 100.00%   100.00%    
Investment Owned, At Cost | Investment Type Concentration Risk | Nonperforming Financial Instruments          
Schedule of Investments [Line Items]          
Concentration risk, percentage (as a percent) 4.20%       3.90%
Private Loan portfolio investments          
Schedule of Investments [Line Items]          
Consultation period subsequent to initial investment 12 months        
Investment company, number of portfolio companies with annual third-party appraisal was obtained, reviewed and certified | company 15 13   60  
Percentage of portfolio with annual third-party appraisal was obtained, reviewed and certified (as a percent)       97.00%  
Investments at fair value: $ 823,100     $ 823,100 $ 809,000
Investment, cost $ 843,100     $ 843,100 821,700
Private Loan portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk          
Schedule of Investments [Line Items]          
Concentration risk, percentage (as a percent) 30.00% 26.00%   83.00%  
LMM portfolio investments          
Schedule of Investments [Line Items]          
Consultation period subsequent to initial investment 12 months        
Investment company, number of portfolio companies with annual third-party appraisal was obtained, reviewed and certified | company 13 12   48  
Percentage of portfolio with annual third-party appraisal was obtained, reviewed and certified (as a percent)       99.00%  
Investments at fair value: $ 507,600     $ 507,600 487,600
Investment, cost $ 399,700     $ 399,700 $ 384,800
LMM portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk          
Schedule of Investments [Line Items]          
Concentration risk, percentage (as a percent) 30.00% 26.00%   96.00%  
Middle Market portfolio investments          
Schedule of Investments [Line Items]          
Percentage of portfolio investments containing limited consultation with financial advisory services firm (as a percent) 86.00%     86.00% 85.00%
Investments at fair value: $ 23,000     $ 23,000 $ 23,300
Investment, cost $ 40,300     40,300 $ 39,800
Middle Market portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk          
Schedule of Investments [Line Items]          
Concentration risk, percentage (as a percent) 1.70%       1.70%
Middle Market portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk          
Schedule of Investments [Line Items]          
Concentration risk, percentage (as a percent) 3.10%       3.20%
Other Portfolio investments          
Schedule of Investments [Line Items]          
Investments at fair value: $ 15,600     15,600 $ 15,500
Investment, cost $ 13,400     $ 13,400 $ 13,700
Other Portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk          
Schedule of Investments [Line Items]          
Concentration risk, percentage (as a percent) 1.10%       1.20%
Other Portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk          
Schedule of Investments [Line Items]          
Concentration risk, percentage (as a percent) 1.00%       1.10%
[1] All portfolio company headquarters are based in the U.S., unless otherwise noted.
[2] Investment Fair Value was determined using significant unobservable inputs, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for further discussion. Negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par.
[3] All investments are LMM (as defined below) portfolio investments, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for a description of LMM portfolio investments. All of the Fund’s investments, unless otherwise noted, are encumbered as security for one of the Credit Facilities (as defined below).
[4] Investment Fair Value was determined using significant unobservable inputs, unless otherwise noted. See Note C — Fair Value Hierarchy for Investments — Portfolio Composition for further discussion. Negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par.
[5] Principal is net of repayments. Cost is net of repayments and accumulated unearned income. Negative cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan.
[6] Principal is net of repayments. Cost is net of repayments and accumulated unearned income. Negative cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan.