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Fair Value Measurements (Details) - Schedule of Reconciliation of the Beginning and Ending Balances for Investments that Use Level 3 Inputs - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning $ 165,316 $ 146,675
Purchases and other adjustments to cost 104,750 41,632
Sales (including repayments or maturities) (110,866) (33,751)
Net realized gains/(losses) from investments 6,962 (816)
Net unrealized gains/(losses) (1,218) 9,477
Transfer in/(out) (23,559)
Balance at ending 141,385 163,217
Senior Secured First Lien Term Loans [Member] | Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning 82,499  
Purchases and other adjustments to cost 28,457  
Sales (including repayments or maturities) (29,587)  
Net realized gains/(losses) from investments (8,785)  
Net unrealized gains/(losses) 22,220  
Transfer in/(out) (23,559)  
Balance at ending 71,245  
Senior Secured Notes [Member] | Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning  
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 10,422  
Equities/ Warrants [Member] | Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning 82,817 69,816
Purchases and other adjustments to cost 42,293 17,883
Sales (including repayments or maturities) (57,701) (23,858)
Net realized gains/(losses) from investments 15,747 (927)
Net unrealized gains/(losses) (23,438) 13,055
Transfer in/(out)
Balance at ending $ 59,718 75,969
Senior Secured First Lien Term Loans [Member] | Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning   74,252
Purchases and other adjustments to cost   22,722
Sales (including repayments or maturities)   (7,256)
Net realized gains/(losses) from investments   105
Net unrealized gains/(losses)   (3,698)
Transfer in/(out)  
Balance at ending   86,125
Senior Secured Second Lien Term Loans [Member] | Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning   2,607
Purchases and other adjustments to cost  
Sales (including repayments or maturities)   (2,607)
Net realized gains/(losses) from investments   5
Net unrealized gains/(losses)   (5)
Transfer in/(out)  
Balance at ending  
Unsecured Debt [Member] | Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning  
Purchases and other adjustments to cost  
Sales (including repayments or maturities)   (30)
Net realized gains/(losses) from investments   1
Net unrealized gains/(losses)   190
Transfer in/(out)  
Balance at ending   161
Fund Investment [Member] | Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning  
Purchases and other adjustments to cost   1,027
Sales (including repayments or maturities)  
Net realized gains/(losses) from investments  
Net unrealized gains/(losses)   (65)
Transfer in/(out)  
Balance at ending   $ 962