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, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Supplemental Statement of Cash Flows Information
Interest paid, net of amounts capitalized			$ 14,146	$ 22,173
Income taxes paid			65,283	44,661
Income tax refunds received			11,012	1,294
Non-cash activities:
Purchases of property, plant and equipment on account			2,325	8,081
Impact of the adoption of ASC 606				38,700
Impact of the adoption of ASC 842 (Note 5)			255
Impact of the adoption of ASU 2016-16				1,005
Common shares issued from treasury to settle benefit obligations (Note 21)	$ 14,748	$ 14,846	$ 14,748	14,846
Purchases of treasury stock on account				$ 4,204