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Supplemental Statements of Cash Flows Information (Schedule of Cash Flow Supplemental Disclosures) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Supplemental Statements of Cash Flows Information |  |
Interest paid, net of amounts capitalized | $ 10,317 | $ 14,878
Income taxes paid | 6,047 | 3,667
Income tax refunds received | 59 | 913
Purchases of property, plant and equipment on account | 6,130 | 26,666
Common shares issued from treasury stock to settle employee liabilities | $ 1,767 | $ 0

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