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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2016 USD ($) site	Sep. 30, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Number of MGP sites | site	5
Recovery of expenditures, including carrying costs, rolling period approved by the BPU	7 years
Site Contingency [Line Items]
Regulatory assets	$ 436,178	$ 410,155
Minimum [Member]
Site Contingency [Line Items]
Litigation settlement, gross	150,900
Maximum [Member]
Site Contingency [Line Items]
Litigation settlement, gross	242,100
Environmental Remediation Costs Expended, Net of Recoveries [Member]
Site Contingency [Line Items]
Regulatory assets	16,122	18,886
Environmental Remediation Costs Liability for Future Expenditures [Member]
Site Contingency [Line Items]
Regulatory assets	178,512	$ 180,400
SBC [Member] | September 2014 SBC Filing [Member]
Site Contingency [Line Items]
Requested rate, amount	$ 8,500

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Number of Manufactured Gas Plant Sites

+ References

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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

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