COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) (USD $)	0 Months Ended			9 Months Ended
	Mar. 20, 2013	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]	Jun. 30, 2013 Environmental Remediation Costs Expended, Net of Recoveries [Member]	Sep. 30, 2012 Environmental Remediation Costs Expended, Net of Recoveries [Member]	Jun. 30, 2013 Environmental Remediation Costs Liability for Future Expenditures [Member]	Sep. 30, 2012 Environmental Remediation Costs Liability for Future Expenditures [Member]
Site Contingency [Line Items]
Site contingency, recovery from third party of environmental remediation cost	$ 20,000,000
Regulatory assets		460,232,000	441,263,000			47,405,000	59,745,000	182,000,000	182,000,000
Litigation settlement, gross				$ 159,600,000	$ 266,400,000