v3.26.1
Fair Value of Financial Instruments - Net Change in Fair Value on Foreign Currency Translation on Outstanding Borrowings (Details)
£ in Thousands, $ in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Jun. 30, 2026
GBP (£)
Jun. 30, 2026
CAD ($)
Sep. 30, 2025
GBP (£)
Sep. 30, 2025
CAD ($)
Net Change In Fair Value On Foreign Currency Translation On Outstanding Borrowings [Line Items]            
Amount Borrowed $ 309,755 $ 425,477        
Borrowing Cost $ 311,456 $ 426,456        
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
Current Value           2,012
Reset Date Jul. 29, 2026 Oct. 29, 2025        
Unrealized appreciation/ (depreciation)       62   $ 24
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 2,036 49,420  
Current Value     47,781 $ 1,974 48,465  
Reset Date Sep. 30, 2026 Dec. 31, 2025        
Unrealized appreciation/ (depreciation) | £     £ 1,639   £ 955