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REGULATION - REGULATORY FILINGS (Details) - USD ($) $ in Millions |  |  |  |  |  | 6 Months Ended
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Mar. 29, 2018 | Mar. 28, 2018 | Mar. 26, 2018 | Mar. 01, 2018 | Nov. 01, 2017 | Mar. 31, 2018
SAVEGREEN |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  | $ (3.9) |
Requested capital investments |  | $ 341.0 |  |  |  |
RAC |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ (2.4)
NJCEP |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 1.8
March 2018 Required BPU Filing |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ (19.7) |  |
Requested customer refunds, amount |  |  |  | $ 31.0 |  |
March 2018 Annual Petition BPU Filing |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 6.9 |  |  |  |  |
Natural Gas Distribution |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, regulatory liability |  |  |  |  |  | 228.4
Tax Cuts and Jobs Act of 2017, revaluation of deferred income taxes, provisional liability |  |  |  |  |  | 164.3
Tax Cuts and Jobs Act of 2017, income tax effects on revaluation, provisional liability |  |  |  |  |  | $ 64.1
Conservation Incentive Program | March 2018 BGSS/CIP Filing |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  | $ (16.2) |  |  |
Increase (decrease) in annual revenues |  |  | $ 3.7 |  |  |

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