v3.25.4
Fair Value of Financial Instruments - Net Change in Fair Value on Foreign Currency Translation on Outstanding Borrowings (Details)
£ in Thousands, $ in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
GBP (£)
Sep. 30, 2024
GBP (£)
Sep. 30, 2024
CAD ($)
Net Change In Fair Value On Foreign Currency Translation On Outstanding Borrowings [Line Items]          
Amount Borrowed | $ $ 425,477 $ 460,361      
Borrowing Cost | $ 426,456 $ 461,456      
Other Currency [Member]          
Net Change In Fair Value On Foreign Currency Translation On Outstanding Borrowings [Line Items]          
Amount Borrowed     £ 2,800   $ 2,800
Borrowing Cost 2,036       2,036
Current Value $ 2,012       2,073
Reset Date Oct. 29, 2025 Oct. 23, 2024      
Unrealized appreciation/ (depreciation) $ 24       $ (37)
Truist Credit Facility          
Net Change In Fair Value On Foreign Currency Translation On Outstanding Borrowings [Line Items]          
Amount Borrowed     36,000 £ 36,000  
Borrowing Cost     49,420 49,420  
Current Value     48,465 48,289  
Reset Date Dec. 31, 2025 Dec. 28, 2024      
Unrealized appreciation/ (depreciation)     £ 955 £ 1,131