Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Income Taxes [Abstract]
Property, Plant and Equipment	$ 1,427,288	$ 1,333,574
Pension and Other Post-Retirement Benefit Costs	239,234	236,431
Other	38,060	43,294
Total Deferred Tax Liabilities	1,704,582	1,613,299
Pension and Other Post-Retirement Benefit Costs	(275,594)	(276,501)
Tax Loss Carryforwards	(188,968)	(198,744)
Other	(94,667)	(83,052)
Total Deferred Tax Assets	(559,229)	(558,297)
Total Net Deferred Income Taxes	1,145,353	1,055,002
Net Deferred Tax Liability/(Asset) - Current	(34,241)	(10,755)
Net Deferred Tax Liability - Non-Current	$ 1,179,594	$ 1,065,757