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COMMITMENTS AND CONTINGENCIES - Commitments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Long-term Purchase Commitment [Line Items] |  |  |
Natural and propane gas purchased | $ 731.7 | $ 433.4 | $ 397.3
Capital Addition Purchase Commitments |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Estimated capital expenditures for fiscal 2015 | 318.3 |  |
Gas Utility | Capital Addition Purchase Commitments |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Estimated capital expenditures for fiscal 2015 | 290.6 |  |
Gas Marketing | Capital Addition Purchase Commitments |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Estimated capital expenditures for fiscal 2015 | 27.7 |  |
Laclede Gas |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Natural and propane gas purchased | 816.9 | 469.1 | 414.8
Laclede Gas | Gas Utility | Capital Addition Purchase Commitments |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Estimated capital expenditures for fiscal 2015 | 205.6 |  |
Laclede Pipeline Company |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Ownership interest in subsidiaries (in percent) | 100.00% |  |
Alagasco |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Natural and propane gas purchased | 33.8 | 50.0 | 51.0
Alagasco | Inventories |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Minimum total payments required for natural gas contracts | 134.0 |  |
Minimum volume purchase commitment required (in Mmcf) | 111,000 |  |
Missouri Gas Energy (MGE) | Gas Utility | Capital Addition Purchase Commitments |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Estimated capital expenditures for fiscal 2015 | 85.0 |  |
Subsidiary of Common Parent | Laclede Gas |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Minimum total payments required for natural gas contracts | 1,345.1 |  |
Purchase Commitment | Subsidiary of Common Parent | Laclede Gas |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Annual purchase commitment | $ 1.0 |  |
Commitment termination minimum required notification period | 6 months |  |

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- Definition Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 25 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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