Quarterly report [Sections 13 or 15(d)]

FAIR VALUE HIERARCHY FOR INVESTMENTS???PORTFOLIO COMPOSITION - Narrative (Details)

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FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
company
entity
investmentManager
Mar. 31, 2025
Jun. 30, 2025
Mar. 31, 2026
USD ($)
company
entity
investmentManager
Dec. 31, 2025
USD ($)
company
entity
investmentManager
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Annualized total return on investments 0.098 0.106      
Achieved total return on investments         0.139
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%
Investment Owned, At Fair Value | Investment Type Concentration Risk          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Concentration risk, percentage (as a percent) 100.00%   100.00%    
Investment Owned, At Cost | Investment Type Concentration Risk          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Concentration risk, percentage (as a percent) 100.00%   100.00%    
Private Loan portfolio investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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
Private Loan portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Concentration risk, percentage (as a percent) 30.00% 26.00%   83.00%  
Private Loan portfolio investments | Debt investments | Investment Owned, At Cost | Investment Type Concentration Risk          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Concentration risk, percentage (as a percent) 93.10%   92.10%    
Private Loan portfolio investments | Minimum          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Annual revenues $ 25,000        
Investments $ 1,000     $ 1,000  
Private Loan portfolio investments | Minimum | Debt investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment, term 3 years        
Private Loan portfolio investments | Maximum          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Annual revenues $ 500,000        
Investments $ 30,000     $ 30,000  
Private Loan portfolio investments | Maximum | Debt investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment, term 7 years        
LMM portfolio investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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
LMM portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Concentration risk, percentage (as a percent) 30.00% 26.00%   96.00%  
LMM portfolio investments | Debt investments | Investment Owned, At Cost | Investment Type Concentration Risk          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Concentration risk, percentage (as a percent) 71.30%   70.60%    
LMM portfolio investments | Minimum          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Annual revenues $ 10,000        
Investments $ 1,000     $ 1,000  
LMM portfolio investments | Minimum | Debt investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment, term 5 years        
LMM portfolio investments | Maximum          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Annual revenues $ 150,000        
Investments $ 30,000     $ 30,000  
LMM portfolio investments | Maximum | Debt investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment, term 7 years        
Middle Market portfolio investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Number of portfolio companies | company 8     8 8
Fair value $ 23,000     $ 23,000 $ 23,300
Cost $ 40,300     40,300 $ 39,800
Middle Market portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Concentration risk, percentage (as a percent) 1.70%       1.70%
Middle Market portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Concentration risk, percentage (as a percent) 3.10%       3.20%
Middle Market portfolio investments | Minimum          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investments $ 1,000     1,000  
Middle Market portfolio investments | Minimum | Debt investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment, term 3 years        
Middle Market portfolio investments | Maximum          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investments $ 20,000     20,000  
Middle Market portfolio investments | Maximum | Debt investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment, term 7 years        
Other Portfolio investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value $ 15,600     15,600 $ 15,500
Cost $ 13,400     $ 13,400 $ 13,700
Number of portfolio investments in entities | entity 7     7 6
Number of portfolio investments with investments managers | investmentManager 4     4 4
Other Portfolio investments | Investment Owned, At Fair Value | Investment Type Concentration Risk          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Concentration risk, percentage (as a percent) 1.10%       1.20%
Other Portfolio investments | Investment Owned, At Cost | Investment Type Concentration Risk          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Concentration risk, percentage (as a percent) 1.00%       1.10%
Other Portfolio investments | Minimum | Debt investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment, term 5 years        
Other Portfolio investments | Maximum | Debt investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment, term 10 years        
[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.