Supplemental Statement of Cash Flows Information (Schedule of Supplemental Statement of Cash Flows Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Supplemental Cash Flow Information [Abstract]
Interest paid, net of amounts capitalized	$ 27,435	$ 27,574	$ 27,148
Income taxes paid	29,560	38,949	94,088
Income tax refunds received	7,481	14,044	17,653
Non-cash activities:
Purchases of property, plant and equipment on account	6,452	7,771	3,076
Impact of the adoption of ASC 842			255
Common shares issued from treasury to settle benefit obligations	$ 17,132	14,900	$ 14,748
Purchases of treasury stock on account		$ 12,516