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COMMITMENTS AND CONTINGENT LIABILITIES - CAPITAL EXPENDITURES (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Gas Distribution [Member]
  
Long-term Purchase Commitment [Line Items]  
Estimated capital expenditures $ 131.2
Estimated capital expenditures subsequent fiscal year 119.9
Capital expenditures paid and accrued 42.3
SAFE Related Expenditures [Member]
  
Long-term Purchase Commitment [Line Items]  
Estimated capital expenditures 27.7
Estimated capital expenditures subsequent fiscal year 43.4
Capital expenditures paid and accrued 1.1
AIP II Construction Costs [Member]
  
Long-term Purchase Commitment [Line Items]  
Capital expenditures paid and accrued 8.6
Natural Disasters and Other Casualty Events [Member]
  
Long-term Purchase Commitment [Line Items]  
Capital expenditures paid and accrued 22.2
Natural Disasters and Other Casualty Events [Member] | Minimum [Member]
  
Long-term Purchase Commitment [Line Items]  
Estimated capital expenditures 20.0
Loss contingency, range of possible loss 30
Natural Disasters and Other Casualty Events [Member] | Maximum [Member]
  
Long-term Purchase Commitment [Line Items]  
Estimated capital expenditures 27.0
Loss contingency, range of possible loss 40
Solar Related Expenditures Land Only [Member]
  
Long-term Purchase Commitment [Line Items]  
Capital expenditures paid and accrued 41.7
Payments to acquire productive assets 15.3
Solar Related Expenditures Land Only [Member] | Minimum [Member]
  
Long-term Purchase Commitment [Line Items]  
Estimated capital expenditures 70.0
Estimated capital expenditures subsequent fiscal year 70.0
Solar Related Expenditures Land Only [Member] | Maximum [Member]
  
Long-term Purchase Commitment [Line Items]  
Estimated capital expenditures 90.0
Estimated capital expenditures subsequent fiscal year $ 90.0