Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Income Taxes [Abstract]
Property, Plant and Equipment	$ 1,517,363	$ 1,504,187
Pension and Other Post-Retirement Benefit Costs	123,294	124,021
Other	72,352	75,419
Total Deferred Tax Liabilities	1,713,009	1,703,627
Pension and Other Post-Retirement Benefit Costs	(130,217)	(130,256)
Tax Loss Carryforwards	(197,411)	(215,262)
Other	(89,931)	(90,461)
Total Deferred Tax Assets	(417,559)	(435,979)
Total Net Deferred Income Taxes	1,295,450	1,267,648
Net Deferred Tax Liability/(Asset) - Current	(23,127)	(79,359)
Net Deferred Tax Liability - Non-Current	$ 1,318,577	$ 1,347,007