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INCOME TAXES - COMPONENTS OF INCOME TAX PROVISION (BENEFIT) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Current:
Federal	$ (16,023)	$ (23,597)	$ 20,492
State	2,470	(2,209)	5,473
Deferred:
Federal	54,965	70,386	56,480
State	11,457	11,441	7,375
Investment/production tax credits	(34,526)	(32,491)	(30,096)
Income tax provision	$ 18,343	$ 23,530	$ 59,724

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

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