v3.26.1
Fair Value Measurements - Schedule of Investments that Use Level 3 Inputs (Details) - Level 3 [Member] - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Schedule of Investments that Use Level 3 Inputs [Line Items]    
Balance at beginning $ 224,187 $ 140,290
Purchases and other adjustments to cost 27,509 121,928
Sales (including repayments or maturities) (6,501) (31,092)
Net realized gains/(losses) from investments (50) (1,388)
Net unrealized gains/(losses) (4,487) (326)
Transfer in/(out)
Balance at ending 240,658 229,412
Senior Secured First Lien Term Loans [Member]    
Schedule of Investments that Use Level 3 Inputs [Line Items]    
Balance at beginning 88,981 68,987
Purchases and other adjustments to cost 14,574 46,455
Sales (including repayments or maturities) (3,835) (19,625)
Net realized gains/(losses) from investments 16 (1,388)
Net unrealized gains/(losses) (4,730) 1,410
Transfer in/(out)
Balance at ending 95,006 95,839
Senior Secured Notes [Member]    
Schedule of Investments that Use Level 3 Inputs [Line Items]    
Balance at beginning 6,997 7,422
Purchases and other adjustments to cost
Sales (including repayments or maturities)
Net realized gains/(losses) from investments
Net unrealized gains/(losses)
Transfer in/(out)
Balance at ending 6,997 7,422
Equities/ Warrants [Member]    
Schedule of Investments that Use Level 3 Inputs [Line Items]    
Balance at beginning 128,209 63,881
Purchases and other adjustments to cost 12,989 75,473
Sales (including repayments or maturities) (2,666) (11,467)
Net realized gains/(losses) from investments (66)
Net unrealized gains/(losses) 189 (1,736)
Transfer in/(out)
Balance at ending $ 138,655 $ 126,151