v3.25.2
Portfolio Investments - Summarized Statement of Operations Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income $ 75,271 $ 94,966 $ 239,486 $ 286,980
Interest expense 31,061 32,513 89,814 96,564
Total expenses 47,093 55,101 141,453 164,559
Net investment income before taxes 33,537 44,575 117,435 130,131
Net increase (decrease) in net assets resulting from operations 38,352 1,120 9,342 20,992
SLF JV I        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 7,339 9,463 22,811 28,665
Other income/Fee income 13 0 19 159
Total investment income 7,352 9,463 22,830 28,824
Other expenses 234 46 427 246
Total expenses 7,203 8,165 21,698 24,352
Net investment income before taxes 149 1,298 1,132 4,472
Net unrealized appreciation (depreciation) (85) (319) (7,016) 1,299
Realized gain (loss) (693) (3,784) (669) (4,343)
Net increase (decrease) in net assets resulting from operations (629) (2,805) (6,553) 1,428
SLF JV I | Senior Credit Facility        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest expense 3,247 4,071 9,930 11,910
SLF JV I | SLF JV I Notes        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest expense 3,722 4,048 11,341 12,196
Glick JV LLC        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 2,603 3,605 8,566 10,926
Other income/Fee income 4 4 8 64
Total investment income 2,607 3,609 8,574 10,990
Other expenses 21 32 108 110
Total expenses 2,697 3,338 8,471 9,766
Net investment income before taxes (90) 271 103 1,224
Net unrealized appreciation (depreciation) 360 328 (30) (321)
Realized gain (loss) (270) (599) (73) (903)
Net increase (decrease) in net assets resulting from operations 0 0 0 0
Glick JV LLC | Senior Credit Facility        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest expense 1,170 1,631 3,754 4,608
Glick JV LLC | Glick JV Notes        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest expense $ 1,506 $ 1,675 $ 4,609 $ 5,048