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ACQUISITION OF MGE Part 1 - Narrative (Details) (USD $)	12 Months Ended					0 Months Ended			0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 Other Operating Expense [Member]	Sep. 30, 2013 Interest on Long-term Debt [Member]	Aug. 13, 2013 Laclede Gas [Member]	Sep. 01, 2013 Missouri Gas Energy (MGE) [Member]	Sep. 01, 2013 Missouri Gas Energy (MGE) [Member] Gas Utility [Member]	May 29, 2013 Missouri Gas Energy (MGE) [Member] Common Stock Issued	Aug. 13, 2013 Missouri Gas Energy (MGE) [Member] Laclede Gas [Member]
Business Acquisition [Line Items]
Acquisition purchase price	$ 975,000,000	$ 0	$ 0				$ 975,000,000
Stock issued to finance acquisition									10,000,000
First mortgage bonds issued to finance acquisition	550,000,000	0	0			450,000,000				450,000,000
Goodwill	247,078,000	0					247,078,000	247,100,000
Merger-related transaction costs	$ 17,000,000	$ 200,000		$ 15,100,000	$ 1,900,000

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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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.

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Number of shares of stock issued during the period pursuant to acquisitions.

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