v3.26.1
Fair Value of Financial Instruments - Additional Information (Details) - Long-Term Credit Facility - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]          
Line of credit facility amendment costs $ 0.5 $ 2.9 $ 0.5 $ 3.3  
Net change in unrealized appreciation (depreciation) 0.1 $ (0.1) 0.1 $ 0.1  
Net unrealized appreciation (depreciation) on the Credit Facility $ 0.0   $ 0.0   $ 0.0