Supplemental Statement of Cash Flows Information (Schedule of Supplemental Statement of Cash Flows Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Supplemental Cash Flow Information [Abstract]
Interest paid, net of amounts capitalized			$ 12,458	$ 14,238
Income taxes paid			20,914	20,843
Income tax refunds received			6,517	12,143
Non-cash activities:
Purchases of property, plant and equipment on account			1,072	2,040
Common shares issued from treasury to settle benefit obligations	$ 17,168	$ 14,900	17,168	$ 14,900
Purchases of treasury stock on account			$ 11,080