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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Sep. 30, 2012
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Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | $ 21,013 | $ 32,734
Regulatory assets-noncurrent | 460,232 | 441,263
Regulatory liability-current | 1,191 | 1,169
Regulatory liabilities-noncurrent | 78,429 | 67,077
Derivatives at Fair Value, Net [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability-current | 1,191 | 1,169
Cost of Removal Obligation [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 77,581 | 65,994
Derivatives at Fair Valu, Net [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 0 | 1,000
Other [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 848 | 83
Conservation Incentive Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 18,954 | 25,681
Underrecovered Gas Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 2,059 | 7,053
Environmental Remediation Costs Expended, Net of Recoveries [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 47,405 | 59,745
Environmental Remediation Costs Liability for Future Expenditures [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 182,000 | 182,000
Deferred Income Taxes [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 11,405 | 11,405
Derivatives at Fair Value, Net [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 386 | 0
Energy Efficiency Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 38,759 | 26,025
New Jersey Clean Energy Program (NJCEP) [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 16,953 | 5,619
Postemployment and Other Benefit Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 135,303 | 142,495
Deferred Superstorm Sandy Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 14,916 | 0
Other [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | $ 13,105 | $ 13,974

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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 Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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