Supplemental Statements of Cash Flows Information (Schedule of Cash Flow Supplemental Disclosures) (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Supplemental Statements of Cash Flows Information
Interest paid, net of amounts capitalized	$ 13,999	$ 18,127
Income taxes paid	9,160	7,470
Income tax refunds received	90	1,361
Purchases of property, plant and equipment on account	7,621	12,028
Property, plant and equipment acquired by capital lease	0	1,239
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
Purchases of treasury stock on account	0	1,745
Cashless exercise of stock options	$ 1,473	$ 555