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REGULATION, REGULATORY ASSETS AND LIABILITIES (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2013 years | Sep. 30, 2012
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets current | $ 34,372,000 | $ 32,734,000
Regulatory assets, noncurrent | 402,202,000 | 441,263,000
Regulatory liabilities, current | 1,456,000 | 1,169,000
Regulatory liability, noncurrent | 79,647,000 | 67,077,000
Regulatory liability, amortization period | 48 |
Derivatives, Net, Current [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities, current | 1,456,000 | 1,169,000
Cost of Removal Obligation [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability, noncurrent | 79,315,000 | 65,994,000
Derivatives, Net, Noncurrent [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability, noncurrent | 0 | 1,000,000
Other Noncurrent Regulatory Liabilities [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability, noncurrent | 332,000 | 83,000
Underrecovered Gas Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets current | 953,000 | 7,053,000
Conservation Incentive Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets current | 18,887,000 | 25,681,000
New Jersey Clean Energy Program [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets current | 14,532,000 | 0
Regulatory assets, noncurrent | 0 | 5,619,000
Enviromental Remediation Costs Expended, Net of Recoveries [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets, noncurrent | 46,968,000 | 59,745,000
Enviromental Remediation Costs Liability for Future Expenditures [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets, noncurrent | 183,600,000 | 182,000,000
Deferred Income and Other Taxes [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets, noncurrent | 10,718,000 | 11,405,000
Derivatives, Net, Noncurrent [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets, noncurrent | 19,000 | 0
SAVEGREEN [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets, noncurrent | 30,004,000 | 26,025,000
Deferred Superstorm Sandy Costs [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets, noncurrent | 14,822,000 | 0
Other Noncurrent Regulatory Assets [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets, noncurrent | 101,415,000 | 142,495,000
Other Regulatory Asset Noncurrent [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets, noncurrent | 14,656,000 | 13,974,000
Regulatory asset, maximum amount to be recorded annually | 700,000 |
Regulatory asset, expense benchmark | 1,400,000 |
Regulatory assets, threshold of recording regulatory liability when net liability exceeds amount | 1,000,000 |
Other Regulatory Asset Noncurrent, PIM [Member] |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets, noncurrent | $ 3,190,000 |

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- Definition Regulatory Asset, Maximum Amount to Be Recorded Annually + References No definition available. + Details
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- Definition Regulatory Assets, Expense Bench Mark + References No definition available. + Details
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- Definition Regulatory Assets, Threshold Of Recording Regulatory Liability When Net Liability Exceeds Amount + 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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- 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 + Details
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