v3.26.1
Borrowings - 2025 Debt Securitization - Narrative (Details)
$ in Thousands
 9 Months Ended
Sep. 18, 2025
USD ($)
Jun. 30, 2026
USD ($)
portfolio_company
Sep. 30, 2025
USD ($)
portfolio_company
Debt Instrument [Line Items]      
Fair value   $ 9,616,525 [1] $ 8,555,251 [2]
2025 Debt Securitization      
Debt Instrument [Line Items]      
Aggregate principal amount $ 868,570    
Debt instrument, basis spread on variable rate   3.70%  
Number of investment portfolio company | portfolio_company   72 59
Fair value   $ 858,420 $ 700,937
2025 Debt Securitization | Class A-1 2025 Notes      
Debt Instrument [Line Items]      
Aggregate principal amount $ 430,000    
Debt instrument, basis spread on variable rate 1.47%    
2025 Debt Securitization | Class A-2 2025 Notes      
Debt Instrument [Line Items]      
Aggregate principal amount $ 14,440    
Debt instrument, basis spread on variable rate 1.65%    
2025 Debt Securitization | Class B 2025 Notes      
Debt Instrument [Line Items]      
Aggregate principal amount $ 59,650    
Debt instrument, basis spread on variable rate 1.80%    
2025 Debt Securitization | Class C Secured Deferrable Floating Rate      
Debt Instrument [Line Items]      
Aggregate principal amount $ 60,340    
2025 Debt Securitization | Subordinated Notes      
Debt Instrument [Line Items]      
Aggregate principal amount 209,140    
2025 Debt Securitization | Class A-1L-1 2025 Loans      
Debt Instrument [Line Items]      
Aggregate principal amount $ 60,000    
Debt instrument, basis spread on variable rate 1.47%    
2025 Debt Securitization | Class A-1L-2 2025 Loans      
Debt Instrument [Line Items]      
Aggregate principal amount $ 10,000    
Debt instrument, basis spread on variable rate 1.47%    
2025 Debt Securitization | Class A-2L 2025 Loans      
Debt Instrument [Line Items]      
Aggregate principal amount $ 20,000    
Debt instrument, basis spread on variable rate 1.65%    
2025 Debt Securitization | Class B-L 2025 Loans      
Debt Instrument [Line Items]      
Aggregate principal amount $ 5,000    
Debt instrument, basis spread on variable rate 1.80%    
Subordinated 2025 Notes due 2125      
Debt Instrument [Line Items]      
Aggregate principal amount $ 209,140    
[1] The fair values of investments were valued using significant unobservable inputs, unless otherwise noted. See Note 6. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.
[2] The fair values of investments were valued using significant unobservable inputs, unless otherwise noted. See Note 6. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.