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LONG-TERM DEBT - Narrative (Details) (USD $) | 12 Months Ended |  |  |  | 0 Months Ended | 12 Months Ended |  |  | 0 Months Ended |  |  |  |  | 0 Months Ended |  |  |  | 0 Months Ended |  |  |  | 0 Months Ended |  |  |  | 0 Months Ended |  |  |  | 0 Months Ended |  |  |  | 0 Months Ended |  | 0 Months Ended |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Aug. 19, 2014 | Jun. 11, 2014 Junior Subordinated Debt | Sep. 30, 2014 Alagasco | Aug. 13, 2013 Laclede Gas | Sep. 30, 2014 Laclede Gas | Sep. 30, 2013 Laclede Gas | Nov. 23, 2012 Laclede Gas | Aug. 13, 2013 Laclede Gas Mortgages | Mar. 15, 2013 Laclede Gas Mortgages | Aug. 13, 2013 Laclede Gas Mortgages | Aug. 19, 2014 Floating Rate Senior Notes, due August 15, 2017 Senior Notes | Aug. 19, 2014 Senior Notes 2.55%, due August 15, 2019 Senior Notes | Aug. 19, 2014 Senior Notes 4.70%, due August 15, 2044 Senior Notes | Sep. 30, 2014 No Call Options | Sep. 30, 2014 No Call Options Laclede Gas | Sep. 30, 2014 Make Whole Call Options | Sep. 30, 2014 Make Whole Call Options Alagasco | Sep. 30, 2014 Make Whole Call Options Laclede Gas | Sep. 30, 2014 2.0% Series A Remarketable Subordinated Notes, due April 1, 2022 Junior Subordinated Debt | Sep. 30, 2014 3% Series, due March 15, 2023 Laclede Gas | Sep. 30, 2013 3% Series, due March 15, 2023 Laclede Gas | Mar. 15, 2013 3% Series, due March 15, 2023 Laclede Gas Mortgages | Mar. 15, 2013 3% Series, due March 15, 2023 Laclede Gas Mortgages | Sep. 30, 2014 3.40% Series, due March 15, 2028 Laclede Gas | Sep. 30, 2013 3.40% Series, due March 15, 2028 Laclede Gas | Mar. 15, 2013 3.40% Series, due March 15, 2028 Laclede Gas Mortgages | Mar. 15, 2013 3.40% Series, due March 15, 2028 Laclede Gas Mortgages | Sep. 30, 2014 2% Series, due August 15, 2018 Laclede Gas | Sep. 30, 2013 2% Series, due August 15, 2018 Laclede Gas | Aug. 13, 2013 2% Series, due August 15, 2018 Laclede Gas Mortgages | Aug. 13, 2013 2% Series, due August 15, 2018 Laclede Gas Mortgages | Sep. 30, 2014 3.40% Series, due August 15, 2023 Laclede Gas | Sep. 30, 2013 3.40% Series, due August 15, 2023 Laclede Gas | Aug. 13, 2013 3.40% Series, due August 15, 2023 Laclede Gas Mortgages | Aug. 13, 2013 3.40% Series, due August 15, 2023 Laclede Gas Mortgages | Sep. 30, 2014 4.625% Series, due August 15, 2043 Laclede Gas | Sep. 30, 2013 4.625% Series, due August 15, 2043 Laclede Gas | Aug. 13, 2013 4.625% Series, due August 15, 2043 Laclede Gas Mortgages | Aug. 13, 2013 4.625% Series, due August 15, 2043 Laclede Gas Mortgages | Sep. 30, 2014 6.35% Series, due October 15, 2038 Laclede Gas | Sep. 30, 2013 6.35% Series, due October 15, 2038 Laclede Gas | Jan. 06, 2014 6.35% Series, due October 15, 2038 Laclede Gas Mortgages | Jan. 06, 2014 6.35% Series, due October 15, 2038 Laclede Gas Mortgages | Aug. 19, 2014 Three-Month LIBOR Floating Rate Senior Notes, due August 15, 2017 Senior Notes | Sep. 30, 2014 Three to six months prior to maturity Subject to Callable at Par | Sep. 30, 2014 Three to six months prior to maturity Subject to Callable at Par Laclede Gas | Sep. 30, 2014 One year prior to maturity Subject to Callable at Par | Sep. 30, 2014 30 days' notice Subject to Callable at Par | Sep. 30, 2014 30 days' notice Subject to Callable at Par Alagasco | Nov. 03, 2014 Subsequent Event Alagasco
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt issued amount |  |  |  | $ 625,000,000.0 |  |  |  |  |  |  |  |  | $ 450,000,000.0 | $ 250,000,000.0 | $ 125,000,000.0 | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | three-month LIBOR |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |
Stated interest rate on debt issued |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  | 2.55% | 4.70% |  |  |  |  |  |  | 3.00% | 3.00% |  | 300.00% | 3.40% | 3.40% |  | 3.40% | 2.00% | 2.00% |  | 2.00% | 3.40% | 3.40% |  | 340.00% | 4.625% | 4.625% |  | 4.625% | 6.35% | 6.35% |  | 6.35% |  |  |  |  |  |  |
Long-term Debt | 1,853,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  | 675,000,000 |  |  | 143,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 725,000,000 |  | 250,000,000 | 34,800,000 |  |
Fixed-rate long-term debt amount | 1,603,600,000 |  |  |  |  | 249,800,000 |  | 810,000,000 |  |  |  |  |  |  |  |  |  | 25,000,000 |  | 215,000,000 | 435,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000,000 |  |  | 34,800,000 | 35,000,000
Fixed-rate long-term debt, interest rate (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.70% |
Long-term debt amount bearing variable interest rate | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum redemption amount per year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 | 800,000 |
Issuance of first mortgage bonds |  |  |  |  |  |  | 450,000,000 |  |  |  | 450,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 55,000,000 |  |  |  | 45,000,000 |  |  |  | 100,000,000 |  |  |  | 250,000,000 |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt issued, maturity term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt | 80,000,000 | 0 | 0 |  |  |  |  | 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000,000 |  |  |  |  |  |  |  |
MoPSC authorized debt issuance through June 30, 2013 - maximum available |  |  |  |  |  |  |  |  |  | $ 518,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares authorized (in shares) | 5,000,000 | 1,480,000 |  |  |  |  |  | 5,000,000 | 1,480,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount authorized by State regulatory for the issuance of debt securities, preferred stock, capital leases, and to issue common stock and receive paid-in capital which remains available to issue at period end + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 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 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + 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 210.5-02.28) -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 29 -Article 5 + Details
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- Definition The cash inflow from amounts received from a long-term debt instrument secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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