COMMITMENTS AND CONTINGENT LIABILITIES, CAPITAL EXPENDITURES (Details) (USD $)	6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Long-term Purchase Commitment [Line Items]
Payments to Acquire Other Productive Assets	$ 61,786,000	$ 11,533,000
Solar Related Expenditures [Member]
Long-term Purchase Commitment [Line Items]
Estimated Capital Expenditures	82,600,000
Estimated Capital Expenditures Subsequent Fiscal Year	90,000,000
Payments to Acquire Productive Assets	61,800,000
Capital Expenditures Paid and Committed	79,800,000
Gas Distribution [Member]
Long-term Purchase Commitment [Line Items]
Estimated Capital Expenditures	121,200,000
Estimated Capital Expenditures Subsequent Fiscal Year	70,000,000
Capital Expenditures Paid And Accrued	49,100,000
AIP II Construction Costs [Member]
Long-term Purchase Commitment [Line Items]
Estimated Capital Expenditures	49,900,000
Capital Expenditures Paid And Accrued	$ 14,900,000