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Fair Value Measurements - Schedule of Investments that Use Level 3 Inputs (Details) - Level 3 [Member] - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments that Use Level 3 Inputs [Line Items]    
Balance at beginning $ 140,290 $ 165,316
Purchases and other adjustments to cost 95,755 14,512
Sales (including repayments or maturities) (16,404) (16,654)
Net realized gains/(losses) from investments 84 266
Net unrealized gains/(losses) (748) 479
Transfer in/(out)  
Balance at ending 218,977 163,919
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 26,271 7,760
Sales (including repayments or maturities) (10,166) (8,802)
Net realized gains/(losses) from investments 84 (12)
Net unrealized gains/(losses) (789) 951
Transfer in/(out)  
Balance at ending 84,387 82,396
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)
Transfer in/(out)
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 69,484 6,752
Sales (including repayments or maturities) (6,238) (7,852)
Net realized gains/(losses) from investments 278
Net unrealized gains/(losses) 41 (472)
Transfer in/(out)
Balance at ending $ 127,168 $ 81,523