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INCOME TAXES, COMPONENTS OF INCOME TAX PROVISION (BENEFIT) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Current: |  |  |
Federal | $ (23,597) | $ 20,492 | $ 37,904
State | (2,209) | 5,473 | 11,096
Deferred: |  |  |
Federal | 70,386 | 56,480 | 24,963
State | 11,441 | 7,375 | 960
Investment/production tax credits | (32,491) | (30,096) | (23,083)
Income tax provision | $ 23,530 | $ 59,724 | $ 51,840

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