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Income Taxes - Provisions for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Current expense (benefit):
Federal	$ 38,786	$ 21,807	$ (909)
State	11,449	11,824	2,735
Deferred expense:	50,235	33,631	1,826
Deferred expense:
Federal	29,208	33,349	48,336
State	4,717	2,274	5,257
Investment tax credit amortization	(337)	(342)	(346)
Total income tax expense	$ 83,823	$ 68,912	$ 55,073

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.