v3.26.1
Fair Value of Financial Instruments - Summary of Outstanding Non US Dollar on Credit Facility (Details)
$ in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Sep. 30, 2025
USD ($)
Mar. 31, 2026
CAD ($)
Sep. 30, 2025
CAD ($)
Net Change In Fair Value On Foreign Currency Translation On Outstanding Borrowings [Line Items]        
Credit Facility $ 328,333 $ 683,837    
Borrowing Cost 328,355 683,855    
Prior Credit Facility        
Net Change In Fair Value On Foreign Currency Translation On Outstanding Borrowings [Line Items]        
Credit Facility     $ 2,000 $ 2,000
Borrowing Cost 1,455 1,455    
Current Value $ 1,433 $ 1,437    
Reset Date Apr. 01, 2026 Oct. 01, 2025    
Unrealized appreciation (depreciation) $ (22) $ (18)