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Borrowings (Details) - Schedule of consolidated statements of assets and liabilities - Level 1 [Member] - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2023
Sep. 30, 2022
Borrowings (Details) - Schedule of consolidated statements of assets and liabilities [Line Items]    
Total debt issuance costs $ 1,957 $ 5,413
Amortized debt issuance costs 92 3,354
Unamortized debt issuance costs 1,865 2,059
2023 Notes [Member]    
Borrowings (Details) - Schedule of consolidated statements of assets and liabilities [Line Items]    
Total debt issuance costs 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 costs 1,937 2,311
Amortized debt issuance costs 72 291
Unamortized debt issuance costs $ 1,865 $ 2,020