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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, 2016
Mar. 31, 2015
Supplemental Statements of Cash Flows Information    
Interest paid, net of amounts capitalized $ 18,127 $ 15,507
Income taxes paid 7,470 31,060
Income tax refunds received 1,361 387
Purchases of property, plant and equipment on account 12,028 54,381
Property, plant and equipment acquired by capital lease 1,239 0
Common shares issued from treasury to settle benefit plan obligations (Note 17) 13,999 12,574
Purchases of treasury stock on account 1,745 0
Cashless exercise of stock options $ 555 $ 0