Quarterly report [Sections 13 or 15(d)]

FAIR VALUE HIERARCHY FOR INVESTMENTS???PORTFOLIO COMPOSITION - Schedule of Investments (Details)

v3.26.1
FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Schedule of Investments (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
company
Mar. 31, 2025
Jun. 30, 2025
Mar. 31, 2026
USD ($)
company
Dec. 31, 2025
USD ($)
company
Summary of Investment Holdings [Line Items]          
Fair value $ 1,369,202 [1],[2],[3]     $ 1,369,202 [1],[2],[3] $ 1,335,387 [4]
Cost $ 1,296,530 [1],[3],[5]     1,296,530 [1],[3],[5] $ 1,259,923 [6]
Concentration risk, percentage (as a percent) 100.00%       100.00%
Nonperforming Financial Instruments          
Summary of Investment Holdings [Line Items]          
Fair value $ 15,100     15,100 $ 13,700
Cost $ 55,000     $ 55,000 $ 49,000
Investment Owned, At Cost | Investment Type Concentration Risk          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 100.00%   100.00%    
Investment Owned, At Cost | Investment Type Concentration Risk | Nonperforming Financial Instruments          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 4.20%       3.90%
Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 13.90%   14.70%    
Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 85.60%   85.10%    
Investment Owned, At Fair Value | Investment Type Concentration Risk          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 100.00%   100.00%    
Investment Owned, At Fair Value | Investment Type Concentration Risk | Nonperforming Financial Instruments          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 1.10%       1.00%
Investment Owned, At Fair Value | Investment Type Concentration Risk | Equity investments          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 21.80%   22.30%    
Investment Owned, At Fair Value | Investment Type Concentration Risk | First lien debt          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 77.30%   77.10%    
Private Loan portfolio investments          
Summary of Investment Holdings [Line Items]          
Number of portfolio companies | company 80     80 81
Fair value $ 823,100     $ 823,100 $ 809,000
Cost $ 843,100     $ 843,100 $ 821,700
Weighted-average annual effective yield (as a percent) 10.50%     10.50% 10.70%
Average EBITDA $ 30,600     $ 30,600 $ 30,000
Investment company, number of companies within portfolio excluded from EBITDA calculation | company 4       4
Private Loan portfolio investments | Nonperforming Financial Instruments          
Summary of Investment Holdings [Line Items]          
Weighted-average annual effective yield (as a percent) 10.10%     10.10% 10.30%
Private Loan portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Debt investments          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 93.10%   92.10%    
Private Loan portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 6.90%   7.90%    
Private Loan portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 99.50%   99.90%    
Private Loan portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 30.00% 26.00%   83.00%  
LMM portfolio investments          
Summary of Investment Holdings [Line Items]          
Number of portfolio companies | company 55     55 55
Fair value $ 507,600     $ 507,600 $ 487,600
Cost $ 399,700     $ 399,700 $ 384,800
Weighted-average annual effective yield (as a percent) 12.60%     12.60% 12.40%
Average EBITDA $ 12,100     $ 12,100 $ 11,700
Diluted equity ownership percentage (as a percent) 8.00%     8.00% 8.00%
Investment company, number of companies within portfolio excluded from EBITDA calculation | company 3       3
LMM portfolio investments | Nonperforming Financial Instruments          
Summary of Investment Holdings [Line Items]          
Weighted-average annual effective yield (as a percent) 11.90%     11.90% 11.70%
LMM portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Debt investments          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 71.30%   70.60%    
LMM portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | Equity investments          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 28.70%   29.40%    
LMM portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk | First lien debt          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 99.90%   99.90%    
LMM portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk          
Summary of Investment Holdings [Line Items]          
Concentration risk, percentage (as a percent) 30.00% 26.00%   96.00%  
[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.