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, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Current Income Taxes - Federal	$ 0	$ (7)
Current Income Taxes - State	2,549	1,334
Deferred Income Taxes - Federal	34,903	31,338
Deferred Income Taxes - State	6,097	8,060
Income Tax Expense	43,549	40,725
Deferred Investment Tax Credit	(107)	(145)
Total Income Taxes	43,442	40,580
Other Income	(107)	(145)
Income Tax Expense	$ 43,549	$ 40,725