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REGULATION, REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets-current | $ 24,258 | $ 26,862
Regulatory assets-noncurrent | 410,155 | 377,575
Regulatory Liabilities [Line Items] |  |
Regulatory liability-current | 12,154 | 6,072
Regulatory liabilities-noncurrent | 67,533 | 61,326
Conservation Incentive Program [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liability-current | 5,167 | 5,752
Overrecovered Gas Costs [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liability-current | 6,987 | 0
Derivatives at Fair Value, Net [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liability-current | 0 | 320
Regulatory liabilities-noncurrent | 0 | 57
Cost of Removal Obligation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 54,880 | 61,163
New Jersey Clean Energy Program [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 11,956 | 0
Other Noncurrent Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 697 | 106
New Jersey Clean Energy Program [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-current | 14,293 | 14,285
Underrecovered Gas Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-current | 0 | 12,577
Derivatives at Fair Value, Net [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-current | 9,965 | 0
Regulatory assets-noncurrent | 5,153 | 0
Enviromental Remediation Costs Expended, Net of Recoveries [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 18,886 | 30,916
Environmental Restoration Costs, Liability for Future Expenditures [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 180,400 | 177,000
Deferred Income Taxes [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 17,460 | 9,968
SAVEGREEN [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 26,882 | 29,180
Postemployment and Other Benefit Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 140,636 | 108,507
Deferred Superstorm Sandy Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 15,201 | 15,207
Other Noncurrent Regulatory Asset [Member] |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | $ 5,537 | $ 6,797

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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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