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Fair Value Measurements - Schedule of Investments that Use Level 3 Inputs (Details) - Level 3 [Member] - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Schedule of Investments that Use Level 3 Inputs [Line Items]    
Balance at beginning $ 140,290 $ 165,316
Purchases and other adjustments to cost 143,044 104,750
Sales (including repayments or maturities) (48,172) (110,866)
Net realized gains/(losses) from investments (13,388) 6,962
Net unrealized gains/(losses) 6,545 (1,218)
Transfer in/(out) (7,995) (23,559)
Balance at ending 220,324 141,385
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 66,391 28,457
Sales (including repayments or maturities) (35,192) (29,587)
Net realized gains/(losses) from investments (11,617) (8,785)
Net unrealized gains/(losses) 9,617 22,220
Transfer in/(out) (7,883) (23,559)
Balance at ending 90,303 71,245
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 34,000
Sales (including repayments or maturities) (23,578)
Net realized gains/(losses) from investments
Net unrealized gains/(losses)
Transfer in/(out)
Balance at ending 7,422 10,422
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 76,653 42,293
Sales (including repayments or maturities) (12,983) (57,701)
Net realized gains/(losses) from investments (1,771) 15,747
Net unrealized gains/(losses) (3,069) (23,438)
Transfer in/(out) (112)
Balance at ending $ 122,599 $ 59,718