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COMMITMENTS AND CONTINGENCIES - Contingencies (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended | 36 Months Ended |  |  |  |  | 12 Months Ended |
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Jul. 16, 2013 Laclede Gas | Sep. 30, 2014 Laclede Gas site | Sep. 30, 2007 Laclede Gas | Aug. 30, 2014 Laclede Gas | Sep. 30, 2014 Alagasco site | Sep. 30, 2013 Previous Ownership Laclede Gas site | Sep. 30, 2013 Previous Ownership Missouri Gas Energy (MGE) site | Sep. 30, 2014 Current Ownership Alagasco site | Sep. 30, 2014 Three-year period ending September 30, 2016 Laclede Gas | Sep. 30, 2014 From October 1, 2016 Laclede Gas | Dec. 31, 2013 Removal Action 35th Avenue Superfund Site Alagasco Resident
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant (MGP) sites in Missouri |  | 3 |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant (MGP) sites in Shrewsbury, Missouri |  | 1 |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant (MGP) sites in the City of St. Louis |  | 2 |  |  |  |  |  |  |  |  |
Number of former manufactured gas plant (MGP) |  |  |  |  | 9 | 19 | 7 | 4 |  |  |
Minimum cost estimate for a one-time contractual transfer of risk |  |  |  | $ 8.1 |  |  |  |  |  |  |
Maximum cost estimate for a one-time contractual transfer of risk |  |  |  | 39.3 |  |  |  |  |  |  |
Mopsc original proposed disallowance related to purchased gas costs |  |  | 6.0 |  |  |  |  |  |  |  |
Revenue Sharing Agreements, Term | 3 years |  |  |  |  |  |  |  |  |  |
Revenue sharing agreements, Company's net margin amount subject to reduced sharing percentage |  | $ 2.0 |  |  |  |  |  |  |  |  |
Revenue sharing agreements, Company's net margin amount subject to reduced sharing percentage, Company's percentage share |  | 15.00% |  |  |  |  |  |  | 0.00% | 15.00% |
Number of former manufactured gas distribution |  |  |  |  | 5 |  |  | 1 |  |  |
Number of residents at high levels of contamination |  |  |  |  |  |  |  |  |  |  | 50

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