v3.25.2
Borrowings - 2024 Debt Securitization (Narrative) (Details)
$ in Thousands
9 Months Ended
Nov. 18, 2024
USD ($)
Jun. 30, 2025
USD ($)
portfolioCompany
Sep. 30, 2024
USD ($)
[2]
Debt Instrument [Line Items]      
Investments, at fair value   $ 8,961,549 [1] $ 8,235,411
2024 Debt Securitization      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 2,200,500    
Debt instrument, basis spread on variable rate   4.30%  
Number of investment portfolio company | portfolioCompany   120  
Investments, at fair value   $ 2,187,002  
2024 Debt Securitization | Subordinated debt      
Debt Instrument [Line Items]      
Debt instrument, face amount 517,500    
2024 Debt Securitization | AAA/AAA Class A -1R 2024 Notes      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 1,192,400    
Debt instrument, basis spread on variable rate 1.56%    
2024 Debt Securitization | AAA Class A-2RR 2024 Notes      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 171,600    
Debt instrument, basis spread on variable rate 1.75%    
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.
[2] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. See Note 6.