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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, 2017
Jun. 30, 2016
Supplemental Statements of Cash Flows Information    
Interest paid, net of amounts capitalized $ 24,879 $ 31,764
Income taxes paid 29,807 59,431
Income tax refunds received 158 1,715
Purchases of property, plant and equipment on account 12,252 13,656
Property, plant and equipment acquired by capital lease 0 1,626
Common shares issued from treasury stock to settle employee liabilities 1,767 0
Common shares issued from treasury stock for benefit plans 14,014 13,999
Cashless exercise of stock options $ 1,473 $ 753