v3.26.1
Borrowings - 2025-R Debt Securitization - Narrative (Details)
$ in Thousands
 9 Months Ended
Sep. 25, 2025
USD ($)
Sep. 09, 2024
USD ($)
Sep. 21, 2023
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-R Debt Securitization And 2023 Debt Securitization          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate       3.70%  
Number of investment portfolio company | portfolio_company       114 77
Fair value       $ 904,590 $ 679,738
2023 Debt Securitization          
Debt Instrument [Line Items]          
Aggregate principal amount     $ 693,620    
2023 Debt Securitization | AAA Class A-1 Notes          
Debt Instrument [Line Items]          
Aggregate principal amount     $ 395,500    
Debt instrument, basis spread on variable rate     2.40%    
2023 Debt Securitization | AAA Class A-2 Notes          
Debt Instrument [Line Items]          
Aggregate principal amount     $ 38,500    
Debt instrument, basis spread on variable rate     2.30%    
Realized gain sale of debt   $ 1,274      
2023 Debt Securitization | Subordinated Notes          
Debt Instrument [Line Items]          
Aggregate principal amount     $ 259,620    
Loss on extinguishment of debt $ 1,900        
2025-R Debt Securitization          
Debt Instrument [Line Items]          
Aggregate principal amount 931,550        
2025-R Debt Securitization | AAA Class A-2 Notes          
Debt Instrument [Line Items]          
Aggregate principal amount 20,200        
2025-R Debt Securitization | Subordinated Notes          
Debt Instrument [Line Items]          
Aggregate principal amount 285,650        
2025-R Debt Securitization | Class A-1R 2025 Reset Notes          
Debt Instrument [Line Items]          
Aggregate principal amount $ 500,000        
Debt instrument, basis spread on variable rate 1.45%        
2025-R Debt Securitization | Class A-2R 2025 Reset Notes          
Debt Instrument [Line Items]          
Aggregate principal amount $ 76,200        
Debt instrument, basis spread on variable rate 1.65%        
2025-R Debt Securitization | AA Class B-R Senior Secured Floating Rate Notes          
Debt Instrument [Line Items]          
Aggregate principal amount $ 69,700        
Subordinated 2025 Reset Notes due 2125          
Debt Instrument [Line Items]          
Aggregate principal amount $ 285,650        
[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.