Supplemental Statement of Cash Flows Information (Schedule of Supplemental Statement of Cash Flows Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 35,306	$ 27,435	$ 27,574
Income taxes paid	92,509	29,560	38,949
Income tax refunds received	3,661	7,481	14,044
Non-cash activities:
Purchases of property, plant and equipment on account	11,276	6,452	7,771
Common shares issued from treasury to settle benefit obligations	$ 19,466	$ 17,132	14,900
Purchases of treasury stock on account			$ 12,516