Income Taxes (Significant Components Of Deferred Tax Liabilities And Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Sep. 30, 2011
Income Taxes [Abstract]
Property, Plant and Equipment	$ 1,116,690	$ 1,062,255
Pension and Other Post-Retirement Benefit Costs	213,170	217,302
Other	67,876	70,389
Total Deferred Tax Liabilities	1,397,736	1,349,946
Pension and Other Post-Retirement Benefit Costs	(262,571)	(263,606)
Tax Loss Carryforwards	(83,199)	(71,516)
Other	(75,082)	(74,863)
Total Deferred Tax Assets	(420,852)	(409,985)
Total Net Deferred Income Taxes	976,884	939,961
Net Deferred Tax Liability/(Asset) - Current	(14,921)	(15,423)
Net Deferred Tax Liability - Non-Current	$ 991,805	$ 955,384