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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Current Income Taxes [Abstract]
Federal			$ (686)	$ 27,311
State			18,293	14,195
Deferred Income Taxes [Abstract]
Federal			(184,419)	(134,369)
State			(84,829)	(63,747)
Income Tax Expense (Benefit)	$ 8,740	$ (216,907)	(251,641)	(156,610)
Deferred Investment Tax Credit			(261)	(311)
Total Income Taxes			(251,902)	(156,921)
Presented as Follows [Abstract]
Other Income			(261)	(311)
Income Tax Expense (Benefit)	$ 8,740	$ (216,907)	$ (251,641)	$ (156,610)