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Supplemental Statements of Cash Flows Information (Schedule of Supplemental Statement of Cash Flows Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Supplemental Statement of Cash Flows Information
Interest paid, net of amounts capitalized	$ 16,754	$ 11,302
Income taxes paid	15,858	7,695
Income tax refunds received	444	1,772
Non-cash activities:
Purchases of property, plant and equipment on account	4,580	$ 10,631
Impact of the adoption of ASC 606 (Note 3)	$ 28,886

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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