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INCOME TAXES, INCOME TAX RECONCILIATION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory income tax expense	$ 67,834	$ 52,661	$ 35,213
State income taxes	7,785	5,168	5,434
Depreciation and cost of removal	(4,437)	(5,769)	(3,999)
Investment tax credits	(23,083)	(18,749)	(34,397)
Basis adjustment of solar assets due to ITC	3,959	3,225	5,974
Other	(218)	(961)	(496)
Income tax provision	$ 51,840	$ 35,575	$ 7,729
Effective income tax rate	26.80%	23.60%	7.70%

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Income Tax Reconciliation, Basis Adjustment

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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