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REGULATORY MATTERS (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended |  |  |  |  | 0 Months Ended |  | 12 Months Ended | 165 Months Ended | 12 Months Ended | 0 Months Ended | 15 Months Ended |  | 0 Months Ended | 15 Months Ended | 0 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Laclede Gas | Sep. 30, 2013 Laclede Gas | Jan. 01, 2014 APSC Alagasco | Sep. 30, 2014 APSC Alagasco | Apr. 12, 2014 ISRS charges from February 2013 - December 2013 MoPSC Laclede Gas | Jul. 25, 2014 ISRS charges from March 2014 - August 2014 MoPSC Laclede Gas | Sep. 30, 2014 ISRS charges MoPSC Laclede Gas | May 01, 2014 General Rate Case MoPSC Missouri Gas Energy (MGE) | Sep. 16, 2013 General Rate Case MoPSC Missouri Gas Energy (MGE) | Mar. 21, 2014 ISRS charges from January 2013 - September 2013 MoPSC Missouri Gas Energy (MGE) | Dec. 06, 2013 ISRS charges from January 2013 - September 2013 MoPSC Missouri Gas Energy (MGE) | Jul. 25, 2014 ISRS charges from January 2014 - August 2014 MoPSC Missouri Gas Energy (MGE) | Sep. 30, 2014 Enhanced stability reserve | Sep. 30, 2013 Enhanced stability reserve | Sep. 30, 2014 Enhanced stability reserve Laclede Gas | Sep. 30, 2013 Enhanced stability reserve Laclede Gas | Dec. 01, 2010 Enhanced stability reserve APSC Alagasco | Sep. 30, 2014 Enhanced stability reserve APSC Alagasco | Sep. 30, 2013 Deferred Costs Incurred Prior to YE 1999 | Sep. 30, 2013 Deferred Costs Incurred Prior to YE 1999 | Sep. 30, 2013 ISRS charges Missouri Gas Energy (MGE) | Oct. 01, 2014 Subsequent Event Missouri Gas Energy (MGE) | Oct. 18, 2014 Subsequent Event ISRS charges from March 2014 - August 2014 MoPSC Laclede Gas | Oct. 18, 2014 Subsequent Event ISRS charges from January 2014 - August 2014 MoPSC Missouri Gas Energy (MGE) | Jan. 01, 2014 Minimum APSC Alagasco | Dec. 31, 2013 Minimum APSC Alagasco | Sep. 30, 2014 Minimum Enhanced stability reserve APSC Alagasco | Jan. 01, 2014 Maximum APSC Alagasco | Dec. 31, 2013 Maximum APSC Alagasco | Dec. 01, 2014 Scenario, Forecast APSC Alagasco | Dec. 01, 2019 Scenario, Forecast Enhanced stability reserve APSC Alagasco
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets for which no return on investment during recovery period is provided | $ 445.1 | $ 388.4 | $ 373.9 | $ 388.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining recovery period for regulatory assets for which no return on investment during recovery period is provided | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase |  |  |  |  |  |  |  | 3.1 |  |  | 23.4 |  | 1.6 | 2.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets | 637.4 | 545.9 | 541.7 | 545.9 |  |  |  |  |  |  |  |  |  |  | 3.3 | 0 | 0 | 0 |  |  | 10.5 | 10.5 |  |  |  |  |  |  |  |  |  |  |
Regulatory assets amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred costs recognized to date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.4 |  |  |  |  |  |  |  |  |  |  |
Approved rate increase |  |  |  |  |  |  | 7.0 |  | 9.8 | 7.8 |  | 1.7 |  |  |  |  |  |  |  |  |  |  |  |  | 2.8 | 2.0 |  |  |  |  |  | 2.4 |
Amount of capitalized costs recovered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.3 |  |  |  |  |  |  |  |  |  |
Percent of distribution costs to be recovered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 83.00% |  |  |  |  |  |  |  |  |
Approved return rate on equity (percent) |  |  |  |  | 10.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.50% | 13.15% |  | 10.95% | 13.65% |  |
Maximum return on equity, percentage of prior year revenues (percent) |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate increase (decrease), margin of index range (percent) |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self insurance policy limit per occurrence |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Extraordinary costs related to a single force majeure event limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3 |  |  |  |
Extraordinary costs related to multiple force majeure events limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.4 |  |  |  |
Negative individual large commercial and industrial customer budget revenue variance minimum amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.4 |  |  |  |
Revenue subject to refund recognition period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue subject to refund amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years
Revenue subject to refund annual amortization limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.7

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