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INCOME TAXES, INCOME TAX RECONCILIATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory income tax expense	$ 54,321	$ 84,239	$ 67,834
Change resulting from:
State income taxes	6,044	8,233	7,785
Cost of removal of assets placed in service prior to1981	(5,738)	(5,149)	(4,437)
Investment/production tax credits	(32,491)	(30,096)	(23,083)
Basis adjustment of solar assets due to ITC	4,453	4,861	3,959
Other	(3,059)	(2,364)	(218)
Income tax provision	$ 23,530	$ 59,724	$ 51,840
Effective income tax rate	15.20%	24.80%	26.80%

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Effective Income Tax Rate Reconciliation, Basis Adjustment

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Effective Income Tax Rate Reconciliation, Reconciling Items [Abstract]

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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

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