COMMITMENTS AND CONTINGENT LIABILITIES, CAPITAL EXPENDITURES (Details) (USD $)	9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Long-term Purchase Commitment [Line Items]
Payments to Acquire Other Productive Assets	$ 75,243,000	$ 17,529,000
Solar Related Expenditures [Member]
Long-term Purchase Commitment [Line Items]
Estimated Capital Expenditures	92,400,000
Estimated Capital Expenditures Subsequent Fiscal Year	90,000,000
Payments to Acquire Productive Assets	75,200,000
Capital Expenditures Paid and Committed	86,900,000
Gas Distribution [Member]
Long-term Purchase Commitment [Line Items]
Estimated Capital Expenditures	128,400,000
Estimated Capital Expenditures Subsequent Fiscal Year	70,000,000
Capital Expenditures Paid And Accrued	86,100,000
AIP II Construction Costs [Member]
Long-term Purchase Commitment [Line Items]
Estimated Capital Expenditures	49,900,000
Capital Expenditures Paid And Accrued	$ 29,100,000