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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | $ 18,297 | $ 50,791
Regulatory assets-noncurrent |  | 368,592 | 375,919
Regulatory Liabilities [Line Items] |  |  |
Regulatory liability-current |  | 8,185 | 78
Regulatory liabilities-noncurrent |  | 209,139 | 14,507
Conservation Incentive Program |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory liability-current |  | 6,994 | 0
Tax Act impact |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory liabilities-noncurrent | [1] | 205,410 | 0
Cost of removal |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory liabilities-noncurrent |  | 0 | 7,902
New Jersey Clean Energy Program |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory liabilities-noncurrent |  | 1,902 | 5,795
Other noncurrent regulatory liabilities |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory liabilities-noncurrent |  | 1,827 | 810
Derivatives at fair value, net |  |  |
Regulatory Liabilities [Line Items] |  |  |
Regulatory liability-current |  | 1,191 | 78
New Jersey Clean Energy Program |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | 14,052 | 14,202
Underrecovered gas costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | 4,137 | 9,910
Derivatives at fair value, net |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | 108 | 9,010
Conservation Incentive Program |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-current |  | 0 | 17,669
Environmental remediation costs, Expended, net of recoveries |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent |  | 33,017 | 28,547
Environmental remediation costs, Liability for future expenditures |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent |  | 130,800 | 149,000
Deferred income taxes |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent |  | 17,225 | 21,795
SAVEGREEN |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent |  | 8,636 | 16,302
Postemployment and other benefit costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent |  | 136,716 | 141,433
Deferred Superstorm Sandy costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent |  | 10,858 | 13,030
Cost of removal |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent |  | 22,339 | 0
Other noncurrent regulatory assets |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets-noncurrent |  | $ 9,001 | $ 5,812
[1] | Includes an adjustment related to the re-measurement of NJNG's net deferred tax liabilities to reflect the change in federal tax rates enacted in the Tax Act, which is net of sales tax collected from customers. For a more detailed discussion, see Note 12. Income Taxes.

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