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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, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Supplemental Cash Flow Information [Abstract] |  |  |  |
Interest paid, net of amounts capitalized |  |  | $ 17,689 | $ 12,458
Income taxes paid |  |  | 44,589 | 20,914
Income tax refunds received |  |  | 1,392 | 6,517
Non-cash activities: |  |  |  |
Purchases of property, plant and equipment on account |  |  | 3,743 | 1,072
Common shares issued from treasury to settle benefit obligations | $ 19,307 | $ 17,168 | $ 19,467 | 17,168
Purchases of treasury stock on account |  |  |  | $ 11,080

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