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INCOME TAXES - INCOME TAX RECONCILIATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory income tax expense	$ 52,643	$ 54,321	$ 84,239
Change resulting from:
State income taxes	8,222	6,044	8,233
Cost of removal of assets placed in service prior to1981	(6,886)	(5,738)	(5,149)
Investment/production tax credits	(34,526)	(32,491)	(30,096)
Basis adjustment of solar assets due to ITC	4,256	4,453	4,861
AFUDC equity	(2,624)	(1,531)	(1,339)
Other	(2,742)	(1,528)	(1,025)
Income tax provision	$ 18,343	$ 23,530	$ 59,724
Effective income tax rate	12.20%	15.20%	24.80%

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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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