Supplemental Statements of Cash Flows Information (Schedule of Cash Flow Supplemental Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Supplemental Statements of Cash Flows Information
Interest paid, net of amounts capitalized	$ 26,619	$ 25,463
Income taxes paid	36,345	33,923
Income tax refunds received	1,617	3,371
Purchases of property, plant and equipment on account	19,193	1,026
Common shares issued from treasury stock for benefit plans (Note 18)	11,193	9,780
Notes receivable from municipalities for economic development incentives	6,596	2,064
Cashless exercise of stock options	715	2,645
Settlement of receivable through cashless acquisition of treasury shares in connection with the cashless exercise of stock options	$ 871	$ 3,447