Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Property, Plant and Equipment	$ 1,614,515	$ 1,504,187
Pension and Other Post-Retirement Benefit Costs	113,248	124,021
Other	87,935	75,419
Total Deferred Tax Liabilities	1,815,698	1,703,627
Pension and Other Post-Retirement Benefit Costs	(124,452)	(130,256)
Tax Loss Carryforwards	(171,423)	(215,262)
Other	(103,863)	(90,461)
Total Deferred Tax Assets	(399,738)	(435,979)
Total Net Deferred Income Taxes	1,415,960	1,267,648
Deferred Tax Liability/(Asset) - Current	(40,323)	(79,359)
Deferred Tax Liability - Non-Current	$ 1,456,283	$ 1,347,007