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INCOME TAXES - INCOME TAX RECONCILIATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]      
Federal statutory rate 24.50% 35.00%  
Federal statutory rate without Tax Act impact 12.38%    
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Statutory income tax expense $ 44,014 $ 52,643 $ 54,321
Change resulting from:      
Tax Act - excess deferred income taxes [1] (59,627) 0 0
Tax Act - utility excess deferred income taxes refunded to customers (1) [1] (14,323) 0 0
Tax Act - utility excess deferred income taxes amortized (1) [1] (1,786) 0 0
State income taxes 7,092 8,222 6,044
Cost of removal of assets placed in service prior to1981 (5,829) (6,886) (5,738)
Investment/production tax credits (21,446) (34,526) (32,491)
Basis adjustment of solar assets due to ITC 1,080 4,256 4,453
AFUDC equity (2,117) (2,624) (1,531)
Other (843) (2,742) (1,528)
Income tax (benefit) provision $ (53,785) $ 18,343 $ 23,530
Effective income tax rate [2],[3] (29.94%) 12.20% 15.20%
[1] For a more detailed description, see The Tax Act section of this note.
[2] The U.S. federal statutory rate was 24.5 percent for fiscal 2018 and 35 percent for fiscal 2017 and 2016.
[3] The effective tax rate without the impact of the Tax Act would have been 12.4 percent for fiscal 2018.