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Borrowings (Details) - Schedule of Consolidated Statements of Assets and Liabilities - Level 1 [Member] - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2023
Sep. 30, 2022
Borrowings (Details) - Schedule of Consolidated Statements of Assets and Liabilities [Line Items]    
Total debt issuance cost at the beginning of the period $ 1,885 $ 5,413
Amortized debt issuance costs 103 3,354
Unamortized debt issuance costs 1,782 2,059
2023 Notes [Member]    
Borrowings (Details) - Schedule of Consolidated Statements of Assets and Liabilities [Line Items]    
Total debt issuance cost at the beginning of the period 20 3,102
Amortized debt issuance costs 20 3,063
Unamortized debt issuance costs 39
2028 Notes [Member]    
Borrowings (Details) - Schedule of Consolidated Statements of Assets and Liabilities [Line Items]    
Total debt issuance cost at the beginning of the period 1,865 2,311
Amortized debt issuance costs 83 291
Unamortized debt issuance costs $ 1,782 $ 2,020