Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Income Taxes [Abstract]
Property, Plant and Equipment	$ 1,227,448	$ 1,062,255
Pension and Other Post-Retirement Benefit Costs	205,684	217,302
Other	68,995	70,389
Total Deferred Tax Liabilities	1,502,127	1,349,946
Pension and Other Post-Retirement Benefit Costs	(264,080)	(263,606)
Tax Loss Carryforwards	(107,999)	(71,516)
Other	(81,951)	(74,863)
Total Deferred Tax Assets	(454,030)	(409,985)
Total Net Deferred Income Taxes	1,048,097	939,961
Net Deferred Tax Liability/(Asset) - Current	(14,727)	(15,423)
Net Deferred Tax Liability - Non-Current	$ 1,062,824	$ 955,384