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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS - Targeted and Actual Plan Assets by Category (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013
Alagasco | Pension Plans |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 100.00% |  |  |
Actual allocation of plan assets | 100.00% |  |  |
Alagasco | Pension Plans | Equity Markets |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 46.00% |  |  |
Actual allocation of plan assets | 46.00% |  |  |
Alagasco | Pension Plans | Commodities |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 33.00% |  |  |
Actual allocation of plan assets | 29.00% |  |  |
Alagasco | Pension Plans | Real Estate |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 21.00% |  |  |
Actual allocation of plan assets | 25.00% |  |  |
Alagasco | Postretirement Plans |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 100.00% |  |  |
Actual allocation of plan assets | 100.00% |  |  |
Alagasco | Postretirement Plans | Equity Markets |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 60.00% |  |  |
Actual allocation of plan assets | 60.00% |  |  |
Alagasco | Postretirement Plans | Debt Securities |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 40.00% |  |  |
Actual allocation of plan assets | 40.00% |  |  |
Alagasco | Postretirement Plans | Other |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 0.00% |  |  |
Actual allocation of plan assets | 0.00% |  |  |
Laclede Gas | Pension Plans |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 100.00% |  |  |
Actual allocation of plan assets | 100.00% |  | 100.00% |
Laclede Gas | Pension Plans | Equity Markets |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 45.50% |  |  |
Actual allocation of plan assets | 46.70% |  | 45.90% |
Laclede Gas | Pension Plans | Commodities |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 1.50% |  |  |
Actual allocation of plan assets | 1.50% |  | 1.60% |
Laclede Gas | Pension Plans | Real Estate |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 1.50% |  |  |
Actual allocation of plan assets | 1.50% |  | 3.00% |
Laclede Gas | Pension Plans | Inflation-Indexed Securities |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 1.50% |  |  |
Actual allocation of plan assets | 1.50% |  | 1.40% |
Laclede Gas | Pension Plans | Debt Securities |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 50.00% |  |  |
Actual allocation of plan assets | 48.70% |  | 43.30% |
Laclede Gas | Pension Plans | Other |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 0.00% | [1] |  |
Actual allocation of plan assets | 0.10% | [1] | 4.80% | [1]
Laclede Gas | Postretirement Plans |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 100.00% |  |  |
Actual allocation of plan assets | 100.00% |  | 100.00% |
Laclede Gas | Postretirement Plans | Equity Markets |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 60.00% |  |  |
Actual allocation of plan assets | 59.00% |  | 59.00% |
Laclede Gas | Postretirement Plans | Debt Securities |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 40.00% |  |  |
Actual allocation of plan assets | 39.00% |  | 39.00% |
Laclede Gas | Postretirement Plans | Other |  |  |  |
Targeted and actual plan assets by category [Abstract] |  |  |  |
Targeted allocation of plan assets | 0.00% |  |  |
Actual allocation of plan assets | 2.00% |  | 2.00% |
[1] | Other investments in 2014 and 2013 consist of cash equivalents.

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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