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Supplemental Statement of Cash Flows Information (Schedule of Supplemental Statement of Cash Flows Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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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 |

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