v3.26.1
Borrowings - 2027 Notes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 03, 2021
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Debt Instrument [Line Items]            
Long-term debt   $ 4,537,552   $ 4,537,552   $ 4,900,773
2027 Notes            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 350,000          
Long-term debt   $ 350,000   $ 350,000   $ 350,000
Interest rate 2.05%          
Debt instrument, redemption price, percent 100.00%          
Debt instrument, basis spread on variable rate 0.25%          
Annualized average stated interest rate   2.10% 2.10% 2.10% 2.10%  
Adviser Revolver            
Debt Instrument [Line Items]            
Annualized average stated interest rate   3.50%   3.60%