COMMITMENTS AND CONTINGENT LIABILITIES, LEGAL PROCEEDINGS (Details) (USD $)			12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Enviromental remediation costs expended, net of recoveries [Member]	Sep. 30, 2011 Enviromental remediation costs expended, net of recoveries [Member]	Sep. 30, 2012 Enviromental remediation costs liability for future expenditures [Member]	Sep. 30, 2011 Enviromental 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	441,263,000	434,185,000			59,745,000	75,646,000	182,000,000	182,900,000
Litigation Settlement, Gross			$ 266,400,000	$ 159,600,000