v3.25.4
Significant Accounting Policies - Additional Information (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 04, 2024
USD ($)
Sep. 30, 2025
USD ($)
Portfolio
shares
Sep. 30, 2024
USD ($)
Portfolio
$ / shares
shares
Sep. 30, 2023
USD ($)
Significant Accounting Policies [Line Items]        
Financing receivable, nonaccrual, percent past due on cost basis   1.30% 4.10%  
Financing receivable, nonaccrual, percent past due on fair value basis   0.10% 2.30%  
Provision for taxes on net investment income   $ 2,590 $ 2,602 $ 4,295
Net realized gain (loss) on investments   (52,460) (33,833) (151,516)
Proceeds from public offering   $ 0 $ 552 0
Common stock, shares, issued | shares   65,296,094 65,296,094  
Offsetting losses expected to refund   $ 0    
Holdings II [Member]        
Significant Accounting Policies [Line Items]        
Provision for taxes on net realized gain on investments   100 $ 200 (5,000)
Provision for taxes on net unrealized gain on investments   0 (700) 1,600
Provision for taxes on net realized and unrealized gains on investments   100 (500) (3,400)
Federal Taxes        
Significant Accounting Policies [Line Items]        
Net realized gain (loss) on investments   $ 200 $ 0 $ 0
Equity Distribution Agreements        
Significant Accounting Policies [Line Items]        
Proceeds from public offering $ 100,000      
Common stock, shares, issued | shares     71,594  
Shares Issued Price Per Share | $ / shares     $ 7.72  
Proceeds from Notes issuance     $ 600  
Deferred Offering Costs     $ 300  
Past Due 30 Days or More        
Significant Accounting Policies [Line Items]        
Number of portfolio on nonaccrual | Portfolio   4 2