Retirement Benefits (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Percentage of annual contribution equal to eligible prior year wages			5.00%
Common shares issued for benefit plans	$ 19,307	$ 17,168	$ 19,467	$ 17,168
Treasury Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Common shares issued from treasury stock for benefit plans, shares	187	150	189	150
Common shares issued for benefit plans	$ 8,447	$ 6,567	$ 8,524	$ 6,567