Supplemental Statements of Cash Flows Information (Schedule of Cash Flow Supplemental Disclosures) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Supplemental Statements of Cash Flows Information
Interest paid, net of amounts capitalized	$ 10,317	$ 14,878
Income taxes paid	6,047	3,667
Income tax refunds received	59	913
Purchases of property, plant and equipment on account	6,130	26,666
Common shares issued from treasury stock to settle employee liabilities	$ 1,767	$ 0