Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
Income Taxes [Abstract]
Property, Plant and Equipment	$ 1,185,296	$ 1,062,255
Pension and Other Post-Retirement Benefit Costs	208,404	217,302
Other	68,426	70,389
Total Deferred Tax Liabilities	1,462,126	1,349,946
Pension and Other Post-Retirement Benefit Costs	(263,532)	(263,606)
Tax Loss Carryforwards	(99,590)	(71,516)
Other	(78,496)	(74,863)
Total Deferred Tax Assets	(441,618)	(409,985)
Total Net Deferred Income Taxes	1,020,508	939,961
Net Deferred Tax Liability/(Asset) - Current	(20,281)	(15,423)
Net Deferred Tax Liability - Non-Current	$ 1,040,789	$ 955,384