Supplemental Statements of Cash Flows Information (Schedule of Cash Flow Supplemental Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Supplemental Statements of Cash Flows Information
Interest paid, net of amounts capitalized	$ 12,299	$ 11,981
Income taxes paid	4,601	8,463
Income tax refunds received	0	2,073
Purchases of property, plant and equipment on account	3,414	2,612
Notes receivable from municipalities for economic development incentives	6,486	0
Cashless exercise of stock options	0	1,871
Settlement of receivable through purchase of treasury shares in connection with the cashless exercise of stock options	$ 0	$ 2,106