Income Taxes (Tables)

12 Months Ended

Sep. 30, 2012

Income Taxes [Abstract]

Components Of Federal And State Income Taxes Included In The Consolidated Statements Of Income

	Year Ended September 30
	2012	2011	2010
	(Thousands)
Current Income Taxes —
Federal............................................................................................................................................................................	$ (8)	$ (1,390)	$ 2,074
State................................................................................................................................................................................	6,412	1,520	4,991
Deferred Income Taxes —
Federal............................................................................................................................................................................	111,176	130,434	110,515
State................................................................................................................................................................................	32,974	33,817	24,164
	150,554	164,381	141,744
Deferred Investment Tax Credit.........................................................................................................................	(581)	(697)	(697)
Total Income Taxes...................................................................................................................................................	$ 149,973	$ 163,684	$ 141,047
Presented as Follows:
Other Income...............................................................................................................................................................	$ (581)	$ (697)	$ (697)
Income Tax Expense — Continuing Operations..........................................................................................	150,554	164,381	137,227
Discontinued Operations —
Income from Operations........................................................................................................................................	—	—	493
Gain on Disposal........................................................................................................................................................	—	—	4,024
Total Income Taxes...................................................................................................................................................	$ 149,973	$ 163,684	$ 141,047

Schedule Of Income Tax Reconciliation By Applying Federal Income Tax Rate

	Year Ended September 30
	2012	2011	2010
	(Thousands)
U.S. Income Before Income Taxes.................................................................................................................	$ 370,050	$ 422,086	$ 366,960
Income Tax Expense, Computed at U.S. Federal Statutory Rate of 35%...................................	$ 129,518	$ 147,730	$ 128,436
Increase (Reduction) in Taxes Resulting from:
State Income Taxes................................................................................................................................................	25,601	22,969	18,951
Miscellaneous.............................................................................................................................................................	(5,146)	(7,015)	(6,340)
Total Income Taxes..................................................................................................................................................	$ 149,973	$ 163,684	$ 141,047

Significant Components Of Deferred Tax Liabilities And Assets

	At September 30
	2012	2011
	(Thousands)
Deferred Tax Liabilities:
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
Deferred Tax Assets:
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
Presented as Follows:
Deferred Tax Liability/(Asset) — Current..........................................................................................................................	$ (10,755)	$ (15,423)
Deferred Tax Liability — Non-Current.................................................................................................................................	1,065,757	955,384
Total Net Deferred Income Taxes.........................................................................................................................................	$ 1,055,002	$ 939,961

Reconciliation Of The Change In Unrecognized Tax Benefits

	Year Ended September 30
	2012	2011	2010
	(Thousands)
Balance at Beginning of Year.........................................................................................................................................	$ 7,766	$ 8,490	$ 8,721
Additions for Tax Positions Related to Current Year...........................................................................................	1,600	80	699
Additions for Tax Positions of Prior Years................................................................................................................	2,751	107	45
Reductions for Tax Positions of Prior Years...........................................................................................................	(947)	(911)	(975)
Balance at End of Year.....................................................................................................................................................	$ 11,170	$ 7,766	$ 8,490