v3.25.2
Portfolio Investments - Summarized Balance Sheet Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Investments at fair value $ 2,809,377 $ 2,809,377   $ 3,021,279
Cash and cash equivalents 79,799 79,799   63,966
Restricted cash 0 0   14,577
Other assets 6,585 6,585   775
Total assets 2,964,212 2,964,212   3,198,341
Senior credit facility payable 510,000 510,000   710,000
Secured borrowings 0 0   5,766
Other liabilities 2,381 2,381   4,088
Total liabilities 1,487,743 1,487,743   1,710,530
Total liabilities and net assets 2,964,212 2,964,212   3,198,341
Investment owned, at cost 3,012,589 3,012,589   3,144,919
SLF JV I        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Investments at fair value 332,977 332,977   329,496
Cash and cash equivalents 20,122 20,122   36,082
Restricted cash 2,516 2,516   6,994
Other assets 2,389 2,389   3,260
Total assets 358,004 358,004   375,832
Senior credit facility payable 197,000 197,000   200,000
Secured borrowings 0 0   11,311
Notes payable at fair value 128,750 128,750   128,750
Other liabilities 15,243 15,243   10,007
Total liabilities 340,993 340,993   350,068
Members' equity 17,011 17,011   25,764
Total liabilities and net assets 358,004 358,004   375,832
Investment owned, at cost 348,377 348,377   337,882
Net proceeds   128,750 $ 128,750  
Glick JV LLC        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Investments at fair value 109,333 109,333   124,887
Cash and cash equivalents 17,294 17,294   10,907
Restricted cash 941 941   1,032
Other assets 970 970   8,177
Total assets 128,538 128,538   145,003
Senior credit facility payable 69,000 69,000   79,000
Notes payable at fair value 53,788 53,788   55,886
Other liabilities 5,750 5,750   4,351
Total liabilities 128,538 128,538   145,003
Members' equity 0 0   0
Total liabilities and net assets 128,538 128,538   145,003
Investment owned, at cost 114,441 114,441   $ 127,867
Net proceeds $ 66,685 $ 66,685