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Supplemental Statements of Cash Flows Information (Schedule of Cash Flow Supplemental Disclosures) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Supplemental Statements of Cash Flows Information    
Interest paid, net of amounts capitalized $ 24,966 $ 24,879
Income taxes paid 31,443 29,807
Income tax refunds received 1,760 158
Purchases of property, plant and equipment on account 8,438 12,252
Common shares issued from treasury stock to settle employee liabilities 0 1,767
Common shares issued from treasury stock for benefit plans 14,741 14,014
Cashless exercise of stock options $ 0 $ 1,473