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Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Sep. 30, 2023
USD ($)
Portfolio
Sep. 30, 2022
USD ($)
Portfolio
Sep. 30, 2021
USD ($)
Significant Accounting Policies [Line Items]      
Provision for taxes $ 1,000,000 $ 400,000 $ 400,000
Increase (Decrease) in due to affiliates (3,042,000) 3,383,000 225,000
Deferred tax liability 1,800,000 4,600,000  
Unrealized Gain (Loss), Investment and Derivative, Operating, Tax Expense (Benefit) 2,800,000 4,600,000  
Provision for taxes on net realized gain on investments 300,000 0  
Prepaid tax asset 1,200,000    
Tax accruals relating to uncertain tax positions 0 0 0
Amounts accrued for interest or penalties $ 0 $ 0 $ 0
Past Due 30 Days or More      
Significant Accounting Policies [Line Items]      
Financing receivable, nonaccrual, percent past due on cost basis 0.90% 0.90%  
Financing receivable, nonaccrual, percent past due on fair value basis 0.20% 0.00%  
Number of portfolio on nonaccrual | Portfolio 3 2