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COMMITMENTS AND CONTINGENT LIABILITIES - CAPITAL EXPENDITURES (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Mar. 31, 2013
Gas Distribution [Member] |
Long-term Purchase Commitment [Line Items] |
Estimated capital expenditures | $ 145.8
Estimated capital expenditures subsequent fiscal year | 119.9
Capital expenditures paid and accrued | 64.9
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 | 9.0
AIP II Construction Costs [Member] |
Long-term Purchase Commitment [Line Items] |
Capital expenditures paid and accrued | 10.2
Natural Disasters and Other Casualty Events [Member] |
Long-term Purchase Commitment [Line Items] |
Capital expenditures paid and accrued | 24.1
Natural Disasters and Other Casualty Events [Member] | Minimum [Member] |
Long-term Purchase Commitment [Line Items] |
Estimated capital expenditures | 26.0
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 | 30.0
Loss contingency, range of possible loss | 40
Solar Related Expenditures [Member] |
Long-term Purchase Commitment [Line Items] |
Capital expenditures paid and accrued | 48.9
Payments to acquire productive assets | 24.9
Solar Related Expenditures [Member] | Minimum [Member] |
Long-term Purchase Commitment [Line Items] |
Estimated capital expenditures | 60.0
Solar Related Expenditures [Member] | Maximum [Member] |
Long-term Purchase Commitment [Line Items] |
Estimated capital expenditures | 90.0
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

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- Definition Describes the estimated range of loss from the specified contingency when no single amount within the range appears to be a better estimate than any other amount within the range, may disclose the factors that could cause the estimate to change, and may indicate that a material change in estimate might occur based on a reasonably possible change in circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6143-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 14 -Paragraph 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 13, 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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