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COMMITMENTS AND CONTINGENT LIABILITIES - CAPITAL EXPENDITURES (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2013
Gas Distribution [Member]
Long-term Purchase Commitment [Line Items]
Estimated capital expenditures	$ 146.3
Estimated capital expenditures subsequent fiscal year	119.9
Capital expenditures paid and accrued	100.0
SAFE Related Expenditures [Member]
Long-term Purchase Commitment [Line Items]
Estimated capital expenditures	29.9
Estimated capital expenditures subsequent fiscal year	43.4
Capital expenditures paid and accrued	15.7
AIP II Construction Costs [Member]
Long-term Purchase Commitment [Line Items]
Capital expenditures paid and accrued	11.5
Natural Disasters and Other Casualty Events [Member]
Long-term Purchase Commitment [Line Items]
Capital expenditures paid and accrued	24.7
Natural Disasters and Other Casualty Events [Member] \| Minimum [Member]
Long-term Purchase Commitment [Line Items]
Estimated capital expenditures	26.0
Estimated capital expenditures subsequent fiscal year	30.0
Natural Disasters and Other Casualty Events [Member] \| Maximum [Member]
Long-term Purchase Commitment [Line Items]
Estimated capital expenditures	30.0
Estimated capital expenditures subsequent fiscal year	40.0
Solar Related Expenditures [Member]
Long-term Purchase Commitment [Line Items]
Capital expenditures paid and accrued	51.1
Payments to acquire productive assets	39.8
Solar Related Expenditures [Member] \| Minimum [Member]
Long-term Purchase Commitment [Line Items]
Estimated capital expenditures	55.0
Solar Related Expenditures [Member] \| Maximum [Member]
Long-term Purchase Commitment [Line Items]
Estimated capital expenditures	60.0
Solar Related Expenditures Land Only [Member] \| Minimum [Member]
Long-term Purchase Commitment [Line Items]
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 subsequent fiscal year	$ 90.0

- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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