Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Deferred Tax Liabilities [Abstract]
Property, Plant and Equipment	$ 1,551,701	$ 1,504,187
Pension and Other Post-Retirement Benefit Costs	121,780	124,021
Other	55,562	75,419
Total Deferred Tax Liabilities	1,729,043	1,703,627
Deferred Tax Assets [Abstract]
Pension and Other Post-Retirement Benefit Costs	(132,752)	(130,256)
Tax Loss Carryforwards	(184,123)	(215,262)
Other	(99,087)	(90,461)
Total Deferred Tax Assets	(415,962)	(435,979)
Total Net Deferred Income Taxes	1,313,081	1,267,648
Net Deferred Tax Liability/(Asset) - Current	(39,650)	(79,359)
Net Deferred Tax Liability - Non Current	$ 1,352,731	$ 1,347,007