Supplemental Statements of Cash Flows Information (Schedule of Cash Flow Supplemental Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Supplemental Statements of Cash Flows Information
Interest paid, net of amounts capitalized	$ 13,465	$ 12,945
Income taxes paid	14,343	16,765
Income tax refunds received	1,330	2,905
Purchases of property, plant and equipment on account	8,899	2,868
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 purchase of treasury shares in connection with the cashless exercise of stock options	$ 871	$ 3,447