Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Income Taxes [Abstract]
Property, Plant and Equipment	$ 1,333,574	$ 1,062,255
Pension and Other Post-Retirement Benefit Costs	236,431	217,302
Other	43,294	70,389
Total Deferred Tax Liabilities	1,613,299	1,349,946
Pension and Other Post-Retirement Benefit Costs	(276,501)	(263,606)
Tax Loss Carryforwards	(198,744)	(71,516)
Other	(83,052)	(74,863)
Total Deferred Tax Assets	(558,297)	(409,985)
Total Net Deferred Income Taxes	1,055,002	939,961
Net Deferred Tax Liability/(Asset) - Current	(10,755)	(15,423)
Net Deferred Tax Liability - Non-Current	$ 1,065,757	$ 955,384