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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
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Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | $ 41,574 | $ 50,791
Regulatory assets-noncurrent | 362,150 | 375,919
Regulatory liability-current | 434 | 78
Regulatory liabilities-noncurrent | 237,838 | 14,507
Deferred income taxes |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 229,315 | 0
Derivatives at fair value, net |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability-current | 434 | 78
Regulatory liabilities-noncurrent | 0 | 146
Cost of removal obligation |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 0 | 7,902
New Jersey Clean Energy Program |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 7,527 | 5,795
Other noncurrent regulatory liabilities |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 996 | 664
New Jersey Clean Energy Program |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 12,626 | 14,202
Underrecovered gas costs |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 490 | 9,910
Derivatives at fair value, net |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 18,471 | 9,010
Conservation Incentive Program |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 9,987 | 17,669
Expended, net of recoveries |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 31,236 | 28,547
Liability for future expenditures |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 144,046 | 149,000
Deferred income taxes |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 16,356 | 21,795
SAVEGREEN |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 13,419 | 16,302
Postemployment and other benefit costs |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 138,681 | 141,433
Deferred Post-Tropical Cyclone Sandy costs |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 12,487 | 13,030
Other noncurrent regulatory assets |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | $ 5,925 | $ 5,812

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- Definition Regulatory Assets And Liabilities [Line Items] + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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