v3.26.1
Borrowings - 2024 Debt Securitization - Narrative (Details)
$ in Thousands
9 Months Ended
Nov. 18, 2024
USD ($)
Jun. 30, 2026
USD ($)
portfolioCompany
Sep. 30, 2025
USD ($)
portfolioCompany
Debt Instrument [Line Items]      
Long-term debt   $ 4,537,552 $ 4,900,773
Investments, at fair value   $ 8,196,353 [1] $ 8,769,389 [2]
2024 Debt Securitization      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 2,200,500    
Debt instrument, basis spread on variable rate   3.70%  
Number of investment portfolio company | portfolioCompany   141 126
Investments, at fair value   $ 2,173,981 $ 2,161,579
2024 Debt Securitization | Subordinated debt      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 517,500    
2024 Debt Securitization | Class A-1R 2024 Notes      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 1.56%    
2024 Debt Securitization | Class A-1R 2024 Notes | Senior Notes      
Debt Instrument [Line Items]      
Long-term debt   1,192,400  
2024 Debt Securitization | Class A-2RR 2024 Notes      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 1.75%    
2024 Debt Securitization | Class A-2RR 2024 Notes | Senior Notes      
Debt Instrument [Line Items]      
Long-term debt   $ 171,600  
2024 Debt Securitization | AA Class B-R 2024 Notes      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 165,000    
Debt instrument, basis spread on variable rate 1.70%    
2024 Debt Securitization | A Class C-R 2024 Notes      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 154,000    
Debt instrument, basis spread on variable rate 2.10%    
[1] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. 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 noted otherwise. See Note 6. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.