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Supplemental Statement of Cash Flows Information (Schedule of Supplemental Statement of Cash Flows Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Supplemental Cash Flow Information [Abstract]
Interest paid, net of amounts capitalized	$ 27,148	$ 39,909	$ 29,677
Income taxes paid	94,088	68,112	44,831
Income tax refunds received	17,653	1,454	1,976
Non-cash activities:
Purchases of property, plant and equipment on account	3,076	8,737	11,982
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 22)	$ 14,748	14,846	$ 14,741
Purchases of treasury stock on account		$ 4,204

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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