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REGULATION (Tables) | 6 Months Ended
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Mar. 31, 2018
Regulated Operations [Abstract] |
Schedule of Regulatory Assets and Liabilities | Regulatory assets and liabilities included on the Unaudited Condensed Consolidated Balance Sheets are comprised of the following:
(Thousands) | March 31, 2018 | September 30, 2017
Regulatory assets-current |  |
New Jersey Clean Energy Program | $ | 5,690 |  | $ | 14,202 |
Underrecovered gas costs | 7,549 |  | 9,910 |
Derivatives at fair value, net | 1,812 |  | 9,010 |
Conservation Incentive Program | — |  | 17,669 |
Total current regulatory assets | $ | 15,051 |  | $ | 50,791 |
Regulatory assets-noncurrent |  |
Environmental remediation costs |  |
Expended, net of recoveries | $ | 28,868 |  | $ | 28,547 |
Liability for future expenditures | 142,474 |  | 149,000 |
Deferred income taxes | 16,773 |  | 21,795 |
SAVEGREEN | 7,549 |  | 16,302 |
Postemployment and other benefit costs | 135,930 |  | 141,433 |
Deferred storm damage costs | 11,944 |  | 13,030 |
Other noncurrent regulatory assets | 8,614 |  | 5,812 |
Total noncurrent regulatory assets | $ | 352,152 |  | $ | 375,919 |
Regulatory liability-current |  |
Conservation Incentive Program | $ | 229 |  | $ | — |
Customer refund payable (1) | 28,878 |  | — |
Derivatives at fair value, net | 62 |  | 78 |
Total current regulatory liabilities | $ | 29,169 |  | $ | 78 |
Regulatory liabilities-noncurrent |  |
Deferred income taxes (2) | $ | 210,500 |  | $ | — |
Cost of removal obligation | — |  | 7,902 |
Derivatives at fair value, net | — |  | 146 |
New Jersey Clean Energy Program | 5,914 |  | 5,795 |
Other noncurrent regulatory liabilities | 1,096 |  | 664 |
Total noncurrent regulatory liabilities | $ | 217,510 |  | $ | 14,507 |
(1) | Includes the current portion of 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 of the Tax Act, see Note 11. Income Taxes.
(2) | Includes the long-term portion of an adjustment related to the Tax Act

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- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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