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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Sep. 30, 2012
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Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets current | $ 25,978 | $ 32,734
Regulatory assets noncurrent | 442,208 | 441,263
Regulatory liability current | 0 | 1,169
Regulatory liability noncurrent | 79,025 | 67,077
Derivatives, net, current [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability current | 0 | 1,169
Cost of removal obligation [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability noncurrent | 64,346 | 65,994
Derivatives net, noncurrent [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability noncurrent | 13,189 | 1,000
Other [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability noncurrent | 1,490 | 83
Conservation Incentive Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets current | 18,383 | 25,681
Underrecovered gas costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets current | 7,595 | 7,053
Environmental remediation costs expended, net of recoveries [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets noncurrent | 48,830 | 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 and other taxes [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets noncurrent | 11,405 | 11,405
Energy Efficiency Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets noncurrent | 31,712 | 26,025
New Jersey Clean Energy Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets noncurrent | 7,464 | 5,619
Postemployment and other benefit costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets noncurrent | 137,700 | 142,495
Deferred Superstorm Storm Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets noncurrent | 14,666 | 0
Other [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets noncurrent | $ 8,431 | $ 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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