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
	Dec. 31, 2014	Dec. 31, 2013
Current Income Taxes [Abstract]
Federal	$ 16,528	$ 19,707
State	5,425	5,625
Deferred Income Taxes [Abstract]
Federal	26,193	23,206
State	7,014	6,887
Income Tax Expense	55,160	55,425
Deferred Investment Tax Credit	(104)	(109)
Total Income Taxes	55,056	55,316
Presented as Follows [Abstract]
Other Income	(104)	(109)
Income Tax Expense	$ 55,160	$ 55,425