Income Taxes (Components Of Federal And State Income Taxes Included In The Consolidated Statements Of Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Current Income Taxes [Abstract]
Federal			$ 31,496	$ (518)
State			11,736	3,934
Deferred Income Taxes [Abstract]
Federal			90,693	105,362
State			28,702	35,645
Income Tax Expense	41,107	45,688	162,627	144,423
Deferred Investment Tax Credit			(326)	(320)
Total Income Taxes			162,301	144,103
Presented as Follows [Abstract]
Other Income			(326)	(320)
Income Tax Expense	$ 41,107	$ 45,688	$ 162,627	$ 144,423