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Supplemental Statement of Cash Flows Information (Schedule of Supplemental Statement of Cash Flows Information) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Supplemental Cash Flow Information [Abstract] |  |
Interest paid, net of amounts capitalized | $ 24,323 | $ 36,018
Income taxes paid | 79,353 | 56,210
Income tax refunds received | 15,123 | 1,453
Non-cash activities: |  |
Purchases of property, plant and equipment on account | 2,230 | 4,423
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
Purchases of treasury stock on account |  | $ 4,204

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