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INCOME TAXES - INCOME TAX RECONCILIATION (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |
Statutory income tax expense |  |  | $ 41,896 | $ 29,898 | $ 45,961
Change resulting from: |  |  |  |  |
Investment/production tax credits |  |  | (322) | (4,129) | (10,990)
Cost of removal of assets placed in service prior to 1981 |  |  | (5,362) | (6,349) | (5,829)
AFUDC equity |  |  | (4,933) | (2,313) | (2,117)
State income taxes, net of federal benefit |  |  | 11,965 | 6,262 | 7,322
NJ Unitary method change |  |  | (15,345) | 0 | 0
Valuation allowance |  |  | 13,604 | 0 | 0
Tax Act - utility excess deferred income taxes amortized |  |  | (3,573) | (3,573) | (1,786)
Tax Act - nonutility excess deferred income taxes |  |  | 0 | 0 | (59,627)
Tax Act - utility excess deferred income taxes refunded to customers |  |  | 0 | 0 | (14,323)
Other |  |  | (1,436) | (1,356) | (843)
Income tax expense (benefit) |  |  | $ 36,494 | $ 18,440 | $ (42,232)
Effective income tax rate |  |  | 18.30% | 14.00% | (23.90%)
Federal statutory rate | 21.00% | 35.00% | 21.00% | 21.00% | 24.50%
Effective income tax rate without the impact of the Tax Act |  |  |  |  | 12.40%

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