COMMITMENTS AND CONTINGENT LIABILITIES, LEGAL PROCEEDINGS (Details) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Site Contingency [Line Items]
Site contingency, recovery from third party of environmental remediation cost	$ 20,000,000
Regulatory assets	402,202,000	441,263,000
Minimum [Member]
Site Contingency [Line Items]
Litigation settlement, gross	159,800,000
Maximum [Member]
Site Contingency [Line Items]
Litigation settlement, gross	261,200,000
Enviromental remediation costs expended, net of recoveries [Member]
Site Contingency [Line Items]
Regulatory assets	46,968,000	59,745,000
Enviromental remediation costs liability for future expenditures [Member]
Site Contingency [Line Items]
Regulatory assets	$ 183,600,000	$ 182,000,000