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.

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

Name:	us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) (USD $)			6 Months Ended						6 Months Ended
	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Environmental Remediation Costs Expended, Net of Recoveries [Member]	Sep. 30, 2013 Environmental Remediation Costs Expended, Net of Recoveries [Member]	Mar. 31, 2014 Environmental Remediation Costs Liability for Future Expenditures [Member]	Sep. 30, 2013 Environmental Remediation Costs Liability for Future Expenditures [Member]	Mar. 31, 2014 SBC [Member] July 2013 SBC Filing [Member]
Site Contingency [Line Items]
Annual recovery amount approved by the Board of Public Utilities									$ 18,700,000
Regulatory assets	368,319,000	402,202,000			32,661,000	46,968,000	183,600,000	183,600,000
Litigation settlement, gross			$ 159,800,000	$ 261,200,000