v3.26.1
Investments - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Schedule of Investments [Line Items]    
Principal $ 2,665,667 $ 2,179,985
Amortized Cost 2,674,753 2,176,447
Fair Value 2,667,489 [1] 2,209,174 [2]
Senior secured    
Schedule of Investments [Line Items]    
Principal 120,696 77,389
Amortized Cost 119,922 76,691
Fair Value 120,063 77,408
One stop    
Schedule of Investments [Line Items]    
Principal 2,519,022 2,069,014
Amortized Cost 2,491,420 2,037,002
Fair Value 2,480,728 2,063,173
Second lien    
Schedule of Investments [Line Items]    
Principal 3,736 12,674
Amortized Cost 3,713 12,600
Fair Value 3,736 12,722
Subordinated debt    
Schedule of Investments [Line Items]    
Principal 22,213 20,908
Amortized Cost 22,387 20,615
Fair Value 21,841 20,741
Equity    
Schedule of Investments [Line Items]    
Amortized Cost 37,311 [3],[4] 29,539 [5],[6]
Fair Value $ 41,121 [1],[3],[4] $ 35,130 [2],[5],[6]
[1] The fair values of investments were valued using significant unobservable inputs, unless otherwise noted. See Note 7. 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 7. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.
[3] Equity investments are non-income producing securities, unless otherwise noted.
[4] Ownership of certain equity investments occurs through a holding company or partnership.
[5] Equity investments are non-income producing securities, unless otherwise noted.
[6] Ownership of certain equity investments occurs through a holding company or partnership.