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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
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Dec. 31, 2019 | Dec. 31, 2018
Supplemental Statement of Cash Flows Information |  |
Interest paid, net of amounts capitalized | $ 10,749 | $ 16,754
Income taxes paid | 7,086 | 15,858
Income tax refunds received | 12 | 444
Non-cash activities: |  |
Purchases of property, plant and equipment on account | 2,551 | 4,580
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

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