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Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Portfolio
Mar. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Portfolio
Significant Accounting Policies [Line Items]          
Provision for taxes on net investment income $ 200 $ 100 $ 700 $ 200  
Provision for taxes on unrealized appreciation (depreciation) on investments 3,700 $ (3,800) 2,900 $ (5,300)  
Deferred tax liability 1,600   1,600   $ 4,600
Net provision for taxes on realized gain on investments 300   300   0
Provision for taxes on net realized gain on investments 0   0    
Prepaid tax asset 1,200   $ 1,200    
Excise tax percentage     4.00%    
Effective tax rate before excise tax and income taxes     0.00%    
Federal statutory rate     21.00%    
Prepaid expenses and other assets $ 791   $ 791   $ 748
Past Due 30 Days or More          
Significant Accounting Policies [Line Items]          
Financing receivable, nonaccrual, percent past due on cost basis 2.00%   2.00%   0.90%
Financing receivable, nonaccrual, percent past due on fair value basis 0.00%   0.00%   0.00%
Number of portfolio on nonaccrual | Portfolio     4   2