Supplemental Statement of Cash Flows Information (Schedule of Supplemental Statement of Cash Flows Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 36,700	$ 35,306	$ 27,435
Income taxes paid	152,049	92,509	29,560
Income tax refunds received	6,521	3,661	7,481
Non-cash activities:
Purchases of property, plant and equipment on account	22,056	11,276	6,452
Common shares issued from treasury to settle benefit obligations	$ 21,889	$ 19,466	$ 17,132