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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
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Supplemental Cash Flow Information [Abstract] |  |  |
Interest paid, net of amounts capitalized | $ 27,574 | $ 27,148 | $ 39,909
Income taxes paid | 38,949 | 94,088 | 68,112
Income tax refunds received | 14,044 | 17,653 | 1,454
Non-cash activities: |  |  |
Purchases of property, plant and equipment on account | 7,771 | 3,076 | 8,737
Impact of the adoption of ASC 606 |  |  | 38,700
Impact of the adoption of ASC 842 |  | 255 |
Impact of the adoption of ASU 2016-16 |  |  | 1,005
Common shares issued from treasury to settle benefit obligations | 14,900 | $ 14,748 | 14,846
Purchases of treasury stock on account | $ 12,516 |  | $ 4,204

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