Supplemental Statement of Cash Flows Information (Schedule of Supplemental Statement of Cash Flows Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Supplemental Cash Flow Information [Abstract]
Interest paid, net of amounts capitalized			$ 25,617	$ 24,323
Income taxes paid			33,293	79,353
Income tax refunds received			13,788	15,123
Non-cash activities:
Purchases of property, plant and equipment on account			1,993	2,230
Impact of the adoption of ASC 842				255
Common shares issued from treasury stock for benefit plans	$ 14,900	$ 14,748	$ 14,900	$ 14,748