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Supplemental Statements of Cash Flows Information (Schedule of Cash Flow Supplemental Disclosures) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Supplemental Statements of Cash Flows Information    
Interest paid, net of amounts capitalized $ 14,032 $ 13,999
Income taxes paid 28,592 9,160
Income tax refunds received 1,841 90
Purchases of property, plant and equipment on account 9,051 7,621
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