Retirement Benefits (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Percentage of annual contribution equal to eligible prior year wages			5.00%
Common shares issued from treasury to settle benefit obligations	$ 24,058	$ 21,887	$ 24,912	$ 21,887
Treasury Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Common shares issued from treasury stock for benefit plans, shares	126,000	159,000	131,000	159,000
Common shares issued from treasury to settle benefit obligations	$ 6,295	$ 7,921	$ 6,534	$ 7,921