Supplemental Statements of Cash Flows Information (Schedule of Cash Flow Supplemental Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Supplemental Statements of Cash Flows Information
Interest paid, net of amounts capitalized	$ 12,945	$ 13,021
Income taxes paid	16,765	31,343
Income tax refunds received	2,905	1,711
Purchases of property, plant and equipment on account	2,868	3,294
Common shares issued from treasury stock for benefit plans (Note 17)	9,780	9,335
Note receivable from municipality for economic development incentives	2,064	0
Cashless exercise of stock options	2,645	0
Settlement of receivable through purchase of treasury shares in connection with the cashless exercise of stock options	$ 3,447	$ 0