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Fair Value Measurements - Schedule of Investments that Use Level 3 Inputs (Details) - Level 3 [Member] - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Schedule of Investments that Use Level 3 Inputs [Line Items]    
Balance at beginning $ 140,290 $ 165,316
Purchases and other adjustments to cost 121,928 34,450
Sales (including repayments or maturities) (31,092) (53,752)
Net realized gains/(losses) from investments (1,388) (1,472)
Net unrealized gains/(losses) (326) 5,995
Transfer in/(out)  
Balance at ending 229,412 150,537
Senior Secured First Lien Term Loans [Member]    
Schedule of Investments that Use Level 3 Inputs [Line Items]    
Balance at beginning 68,987 82,499
Purchases and other adjustments to cost 46,455 14,352
Sales (including repayments or maturities) (19,625) (30,946)
Net realized gains/(losses) from investments (1,388) (8,676)
Net unrealized gains/(losses) 1,410 22,752
Transfer in/(out)  
Balance at ending 95,839 79,981
Senior Secured Notes [Member]    
Schedule of Investments that Use Level 3 Inputs [Line Items]    
Balance at beginning 7,422  
Purchases and other adjustments to cost  
Sales (including repayments or maturities)  
Net realized gains/(losses) from investments  
Net unrealized gains/(losses)  
Balance at ending 7,422  
Equities/ Warrants [Member]    
Schedule of Investments that Use Level 3 Inputs [Line Items]    
Balance at beginning 63,881 82,817
Purchases and other adjustments to cost 75,473 20,098
Sales (including repayments or maturities) (11,467) (22,806)
Net realized gains/(losses) from investments 7,204
Net unrealized gains/(losses) (1,736) (16,757)
Transfer in/(out)  
Balance at ending $ 126,151 $ 70,556