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Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
USD ($)
Portfolio
Sep. 30, 2023
USD ($)
Portfolio
Sep. 30, 2022
USD ($)
Significant Accounting Policies [Line Items]      
Provision for taxes $ 1,100 $ 1,000 $ 400
Due to affiliates (566) (3,042) 3,383
Deferred tax liability 1,700 1,800  
Net provision for taxes on realized gain on investments 45 263 0
Provision for taxes on unrealized appreciation (depreciation) on investments (100) (2,800)  
Provision for taxes on net realized gain on investments 0 0 $ 1,200
State and local tax liability 0    
Taxable Subsidiary [Member]      
Significant Accounting Policies [Line Items]      
Net provision for taxes on realized gain on investments $ 100 $ 300  
Past Due 30 Days or More      
Significant Accounting Policies [Line Items]      
Financing receivable, nonaccrual, percent past due on cost basis 0.40% 0.90%  
Financing receivable, nonaccrual, percent past due on fair value basis 0.20% 0.20%  
Number of portfolio on nonaccrual | Portfolio 2 3