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STATEMENT OF CONSOLIDATED CAPITALIZATION (Parenthetical) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Common Stock Equity:
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	70,000,000	70,000,000
Common stock, issued (in shares)	32,696,836	22,539,431
Laclede Group [Member] | 3.31% Notes Payable, due December 15, 2022 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	3.31%
Laclede Gas [Member] | First Mortage Bonds 5-1/2% Series, due May 1, 2019 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	5.50%	5.50%
Laclede Gas [Member] | First Mortage Bonds 7% Series, due June 1, 2029 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	7.00%	7.00%
Laclede Gas [Member] | First Mortage Bonds 7.90% Series, due September 15, 2030 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	7.90%	7.90%
Laclede Gas [Member] | First Mortage Bonds 6% Series, due May 1, 2034 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	6.00%	6.00%
Laclede Gas [Member] | First Mortage Bonds 6.15% Series, due June 1, 2036 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	6.15%	6.15%
Laclede Gas [Member] | First Mortage Bonds 6.35% Series, due October 15, 2038 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	6.35%	6.35%
Laclede Gas [Member] | First Mortage Bonds 3% Series, due March 15, 2023 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	3.00%	3.00%
Laclede Gas [Member] | First Mortage Bonds 3.40% Series, due March 15, 2028 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	3.40%	3.40%
Laclede Gas [Member] | First Mortage Bonds 2% Series, due August 15, 2018 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	2.00%	2.00%
Laclede Gas [Member] | First Mortage Bonds 3.40% Series, due August 15, 2023 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	3.40%	3.40%
Laclede Gas [Member] | First Mortage Bonds 4.625% Series, due August 15, 2043 [Member]
Long - Term Debt - Laclede Gas:
Debt instrument, interest rate, stated percentage	4.625%	4.625%

X

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Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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The maximum number of common shares 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

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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-Publisher FASB

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Contractual interest rate for funds borrowed, under the debt agreement.

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