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Supplemental Statements of Cash Flows Information (Schedule of Cash Flow Supplemental Disclosures) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Supplemental Statements of Cash Flows Information      
Interest paid, net of amounts capitalized $ 34,500 $ 32,608 $ 27,922
Income taxes paid 99,468 51,218 66,477
Income tax refunds received 2,350 689 2,303
Purchases of property, plant and equipment on account 10,705 23,966 13,437
Property, plant and equipment acquired by capital lease 1,653 0 0
Common shares issued from treasury to settle benefit plan obligations (Note 18) 13,999 12,574 11,193
Notes receivable from municipalities for economic development incentives 0 0 6,596
Cashless exercise of stock options $ 753 $ 1,532 $ 1,286