Income Taxes (Components Of Federal And State Income Taxes Included In The Consolidated Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Current Income Taxes [Abstract]
Federal			$ 27,311	$ 31,496
State			14,195	11,736
Deferred Income Taxes [Abstract]
Federal			(134,369)	90,693
State			(63,747)	28,702
Income Tax Expense	$ (216,907)	$ 41,107	(156,610)	162,627
Deferred Investment Tax Credit			(311)	(326)
Total Income Taxes			(156,921)	162,301
Presented as Follows [Abstract]
Other Income			(311)	(326)
Income Tax Expense (Benefit)	$ (216,907)	$ 41,107	$ (156,610)	$ 162,627