Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Income Taxes [Abstract]
Property, Plant and Equipment	$ 1,365,011	$ 1,333,574
Pension and Other Post-Retirement Benefit Costs	240,380	236,431
Other	52,468	43,294
Total Deferred Tax Liabilities	1,657,859	1,613,299
Pension and Other Post-Retirement Benefit Costs	(274,649)	(276,501)
Tax Loss Carryforwards	(192,412)	(198,744)
Other	(83,359)	(83,052)
Total Deferred Tax Assets	(550,420)	(558,297)
Total Net Deferred Income Taxes	1,107,439	1,055,002
Net Deferred Tax Liability/(Asset) - Current	(19,112)	(10,755)
Net Deferred Tax Liability - Non-Current	$ 1,126,551	$ 1,065,757