Income Taxes (Tables)

12 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

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

The components of federal and state income taxes included in the Consolidated Statements of Income are as follows:

	Year Ended September 30
	2017			2016			2015
	(Thousands)
Current Income Taxes —
Federal	$	32,034		$	(6,658	)	$	25,064
State	10,673			20,903			13,387
Deferred Income Taxes —
Federal	103,046			(164,818		)	(244,336		)
State	14,929			(81,976		)	(113,251		)
	160,682			(232,549		)	(319,136		)
Deferred Investment Tax Credit	(173		)	(348		)	(414		)
Total Income Taxes	$	160,509		$	(232,897	)	$	(319,550	)
Presented as Follows:
Other Income	$	(173	)	$	(348	)	$	(414	)
Income Tax Expense (Benefit)	160,682			(232,549		)	(319,136		)
Total Income Taxes	$	160,509		$	(232,897	)	$	(319,550	)

Schedule Of Income Tax Reconciliation By Applying Federal Income Tax Rate

The following is a reconciliation of this difference:

	Year Ended September 30
	2017			2016			2015
	(Thousands)
U.S. Income (Loss) Before Income Taxes	$	443,991		$	(523,855	)	$	(698,977	)
Income Tax Expense (Benefit), Computed at U.S. Federal Statutory Rate of 35%	$	155,397		$	(183,349	)	$	(244,642	)
State Income Taxes (Benefit)	16,641			(39,697		)	(64,912		)
Federal Tax Credits	(6,679		)	(3,262		)	(732		)
Miscellaneous	(4,850		)	(6,589		)	(9,264		)
Total Income Taxes	$	160,509		$	(232,897	)	$	(319,550	)

Significant Components Of Deferred Tax Liabilities And Assets

Significant components of the Company’s deferred tax liabilities and assets were as follows:

	At September 30
	2017			2016
	(Thousands)
Deferred Tax Liabilities:
Property, Plant and Equipment	$	1,141,432		$	1,049,100
Pension and Other Post-Retirement Benefit Costs	79,516			151,903
Unrealized Hedging Gains	19,127			50,179
Other	57,919			55,457
Total Deferred Tax Liabilities	1,297,994			1,306,639
Deferred Tax Assets:
Pension and Other Post-Retirement Benefit Costs	(123,532		)	(195,829		)
Tax Loss and Credit Carryforwards	(200,344		)	(194,875		)
Other	(82,831		)	(92,140		)
Total Deferred Tax Assets	(406,707		)	(482,844		)
Total Net Deferred Income Taxes	$	891,287		$	823,795

Reconciliation Of The Change In Unrecognized Tax Benefits

The following is a reconciliation of the change in unrecognized tax benefits:

	Year Ended September 30
	2017			2016			2015
	(Thousands)
Balance at Beginning of Year	$	396		$	5,085		$	3,147
Additions for Tax Positions of Prior Years	1,251			396			2,504
Reductions for Tax Positions of Prior Years	(396		)	(1,314		)	(566		)
Reductions Related to Settlements with Taxing Authorities	—			(3,771		)	—
Balance at End of Year	$	1,251		$	396		$	5,085

Summary of Operating Loss and Tax Credit Carryforwards

As of September 30, 2017, the Company has the following carryforwards available:

Jurisdiction	Tax Attribute	Amount (Thousands)		Expires
Federal	Net Operating Loss	$	184,289	2028-2033
Pennsylvania	Net Operating Loss	324,572		2030-2035
California	Net Operating Loss	169,723		2029-2035
Federal	Alternative Minimum Tax Credit	81,683		Unlimited
California	Alternative Minimum Tax Credit	5,873		Unlimited
Federal	Enhanced Oil Recovery Credit	10,502		2029-2037
California	Enhanced Oil Recovery Credit	5,061		2021-2037
Federal	R&D Tax Credit	5,694		2031-2036