v3.25.2
Portfolio Investments - Schedule of Financial Instruments Carried at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Schedule of Investments [Line Items]    
Total investments at fair value $ 6,362,926 [1] $ 4,576,233 [2]
Cash equivalents 100,743  
Derivative assets 15,079 21,546
Total assets at fair value 6,478,748 4,597,779
Derivative liabilities 20,475 11,927
Total liabilities at fair value 20,475 11,927
Senior secured debt    
Schedule of Investments [Line Items]    
Total investments at fair value 5,744,828 4,073,936
Subordinated debt (including CLO notes and credit linked notes)    
Schedule of Investments [Line Items]    
Total investments at fair value 586,059 476,093
Common equity and warrants    
Schedule of Investments [Line Items]    
Total investments at fair value 13,308 12,196
Preferred equity    
Schedule of Investments [Line Items]    
Total investments at fair value 18,731 14,008
Level 1    
Schedule of Investments [Line Items]    
Total investments at fair value 23 0
Cash equivalents 100,743  
Derivative assets 0 0
Total assets at fair value 100,766 0
Derivative liabilities 0 0
Total liabilities at fair value 0 0
Level 1 | Senior secured debt    
Schedule of Investments [Line Items]    
Total investments at fair value 0 0
Level 1 | Subordinated debt (including CLO notes and credit linked notes)    
Schedule of Investments [Line Items]    
Total investments at fair value 0 0
Level 1 | Common equity and warrants    
Schedule of Investments [Line Items]    
Total investments at fair value 23 0
Level 1 | Preferred equity    
Schedule of Investments [Line Items]    
Total investments at fair value 0 0
Level 2    
Schedule of Investments [Line Items]    
Total investments at fair value 1,452,468 1,435,507
Cash equivalents 0  
Derivative assets 15,079 21,546
Total assets at fair value 1,467,547 1,457,053
Derivative liabilities 20,475 11,927
Total liabilities at fair value 20,475 11,927
Level 2 | Senior secured debt    
Schedule of Investments [Line Items]    
Total investments at fair value 1,209,294 1,183,356
Level 2 | Subordinated debt (including CLO notes and credit linked notes)    
Schedule of Investments [Line Items]    
Total investments at fair value 243,174 252,151
Level 2 | Common equity and warrants    
Schedule of Investments [Line Items]    
Total investments at fair value 0 0
Level 2 | Preferred equity    
Schedule of Investments [Line Items]    
Total investments at fair value 0 0
Level 3    
Schedule of Investments [Line Items]    
Total investments at fair value 4,910,435 3,140,726
Cash equivalents 0  
Derivative assets 0 0
Total assets at fair value 4,910,435 3,140,726
Derivative liabilities 0 0
Total liabilities at fair value 0 0
Level 3 | Senior secured debt    
Schedule of Investments [Line Items]    
Total investments at fair value 4,535,534 2,890,580
Level 3 | Subordinated debt (including CLO notes and credit linked notes)    
Schedule of Investments [Line Items]    
Total investments at fair value 342,885 223,942
Level 3 | Common equity and warrants    
Schedule of Investments [Line Items]    
Total investments at fair value 13,285 12,196
Level 3 | Preferred equity    
Schedule of Investments [Line Items]    
Total investments at fair value $ 18,731 $ 14,008
[1] Non-Control/Non-Affiliate Investments are investments that are neither Control Investments nor Affiliate Investments. Control Investments generally are defined by the Investment Company Act of 1940, as amended (the “Investment Company Act”), as investments in companies in which the Company owns more than 25% of the voting securities and/or has the power to exercise control over the management or policies of the company. Affiliate Investments generally are defined by the Investment Company Act as investments in companies in which the Company owns between 5% and 25% of the voting securities.
[2] Non-Control/Non-Affiliate Investments are investments that are neither Control Investments nor Affiliate Investments. Control Investments generally are defined by the Investment Company Act, as investments in companies in which the Company owns more than 25% of the voting securities and/or has the power to exercise control over the management or policies of the company. Affiliate Investments generally are defined by the Investment Company Act as investments in companies in which the Company owns between 5% and 25% of the voting securities.