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LONG-TERM DEBT Part 2 - Narrative (Details) (USD $)	12 Months Ended								12 Months Ended					0 Months Ended				0 Months Ended			0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2013	Sep. 30, 2013 No Call Options [Member]	Sep. 30, 2013 Make Whole Call Options [Member]	Sep. 30, 2013 Callable at par in 2013 [Member] Three to six months prior to maturity [Member]	Sep. 30, 2013 Callable at par in 2013 [Member] Beginning October 2013 [Member]	Sep. 30, 2013 Laclede Gas [Member]	Sep. 30, 2012 Laclede Gas [Member]	Nov. 26, 2013 Laclede Gas [Member] Subsequent Event [Member]	Aug. 13, 2013 First Mortgage [Member] Laclede Gas [Member]	Mar. 15, 2013 First Mortgage [Member] Laclede Gas [Member]	Oct. 15, 2012 First Mortgage Bonds 6.5% Series, due October 15, 2012 [Member] First Mortgage [Member] Laclede Gas [Member]	Dec. 14, 2012 3.31% Notes Payable, due December 15, 2022 [Member] Unsecured Debt [Member]	Sep. 30, 2013 First Mortage Bonds 3% Series, due March 15, 2023 [Member] Laclede Gas [Member]	Sep. 30, 2012 First Mortage Bonds 3% Series, due March 15, 2023 [Member] Laclede Gas [Member]	Mar. 15, 2013 First Mortage Bonds 3% Series, due March 15, 2023 [Member] First Mortgage [Member] Laclede Gas [Member]	Sep. 30, 2013 First Mortage Bonds 3.40% Series, due March 15, 2028 [Member] Laclede Gas [Member]	Sep. 30, 2012 First Mortage Bonds 3.40% Series, due March 15, 2028 [Member] Laclede Gas [Member]	Mar. 15, 2013 First Mortage Bonds 3.40% Series, due March 15, 2028 [Member] First Mortgage [Member] Laclede Gas [Member]	Sep. 30, 2013 First Mortage Bonds 2% Series, due August 15, 2018 [Member] Laclede Gas [Member]	Sep. 30, 2012 First Mortage Bonds 2% Series, due August 15, 2018 [Member] Laclede Gas [Member]	Aug. 13, 2013 First Mortage Bonds 2% Series, due August 15, 2018 [Member] First Mortgage [Member] Laclede Gas [Member]	Sep. 30, 2013 First Mortage Bonds 3.40% Series, due August 15, 2023 [Member] Laclede Gas [Member]	Sep. 30, 2012 First Mortage Bonds 3.40% Series, due August 15, 2023 [Member] Laclede Gas [Member]	Aug. 13, 2013 First Mortage Bonds 3.40% Series, due August 15, 2023 [Member] First Mortgage [Member] Laclede Gas [Member]	Sep. 30, 2013 First Mortage Bonds 4.625% Series, due August 15, 2043 [Member] Laclede Gas [Member]	Sep. 30, 2012 First Mortage Bonds 4.625% Series, due August 15, 2043 [Member] Laclede Gas [Member]	Aug. 13, 2013 First Mortage Bonds 4.625% Series, due August 15, 2043 [Member] First Mortgage [Member] Laclede Gas [Member]
Debt Instrument [Line Items]
Maturity of first mortgage bonds	$ 25,000,000	$ 0	$ 25,000,000											$ 25,000,000
Stated interest rate on debt issued														6.50%	3.31%	3.00%	3.00%	3.00%	3.40%	3.40%	3.40%	2.00%	2.00%	2.00%	3.40%	3.40%	3.40%	4.625%	4.625%	4.625%
Debt issued, maturity term															10 years			10 years			15 years
Issuance of debt												450,000,000	100,000,000		25,000,000			55,000,000			45,000,000			100,000,000			250,000,000			100,000,000
Fixed-rate long-term debt amount	915,000,000				50,000,000	435,000,000	350,000,000	80,000,000
MoPSC authorized debt issuance through June 30, 2013 - maximum available				518,000,000					518,000,000
Extension period for debt securities and preferred stock issuance authority	2 years								2 years
MoPSC authorized debt issuance - remaining available	$ 370,800,000										$ 370,800,000
Preferred stock shares authorized (in shares)									1,480,000	1,480,000

X

- Definition

Amount authorized by state regulatory authorities 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

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The period of time for which the company's authority to issue a specified amount of debt securities and preferred stock was extended, in the format PnYnMnD.

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Amount authorized by state regulatory authorities for the issuance of debt securities, preferred stock, capital leases, and to issue common stock and receive paid-in capital.

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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



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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



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-Name Accounting Standards Codification

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-Section S99

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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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.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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The cash outflow from the repayment of a long-term debt instrument issued, 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.

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-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585



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-Glossary Financing Activities

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