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Income Taxes (Components Of Federal And State Income Taxes Included In The Consolidated Statements Of Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Taxes [Abstract]
Current Income Taxes - Federal	$ (632)	$ (8)	$ (1,390)
Current Income Taxes - State	5,503	6,412	1,520
Deferred Income Taxes - Federal	130,318	111,176	130,434
Deferred Income Taxes - State	37,569	32,974	33,817
Income Tax Expense	172,758	150,554	164,381
Deferred Investment Tax Credit	(426)	(581)	(697)
Total Income Taxes	172,332	149,973	163,684
Other Income	$ (426)	$ (581)	$ (697)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.