v3.26.1
Financial Instruments (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Sep. 30, 2025
Financial Instruments, Owned, at Fair Value, by Type, Alternative [Abstract]    
Carrying Amount $ 2,384,882 $ 2,682,861
Fair Value $ 2,379,031 $ 2,696,145