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NOTES PAYABLE AND CREDIT AGREEMENTS - Laclede Group's Short-term Borrowings (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Short-term Debt [Line Items] |  |  |  |
Weighted average borrowings outstanding | $ 82,300,000 | [1] | $ 34,200,000 | [1]
Weighted average interest rate | 0.50% | [1] | 0.30% | [1]
Minimum borrowing outstanding | 0 |  | 0 |
Maximum borrowing outstanding | 300,500,000.0 |  | 99,400,000.0 |
Short-term debt | 287,100,000 | [1] | 74,000,000 | [1]
Weighted average interest rate | 0.50% | [1] | 0.30% | [1]
Line of Credit |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Weighted average borrowings outstanding | 3,600,000 |  | 0 |
Weighted average interest rate | 1.40% |  | 0.00% |
Minimum borrowing outstanding | 0 |  | 0 |
Maximum borrowing outstanding | 40,000,000 |  | 0 |
Short-term debt | 32,500,000 |  | 0 |
Weighted average interest rate | 1.40% |  | 0.00% |
Laclede Gas |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Weighted average borrowings outstanding | 141,000,000 |  | 63,400,000 |
Weighted average interest rate | 0.30% |  | 0.30% |
Minimum borrowing outstanding | 45,500,000.0 |  | 0 |
Maximum borrowing outstanding | 272,100,000.0 |  | 160,500,000.0 |
Short-term debt | 238,600,000 |  | 120,700,000 |
Weighted average interest rate | 0.30% |  | 0.30% |
Laclede Gas | Commercial Paper |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Weighted average borrowings outstanding | 77,600,000 |  | 34,200,000 |
Weighted average interest rate | 0.30% |  | 0.30% |
Minimum borrowing outstanding | 0 |  | 0 |
Maximum borrowing outstanding | 244,500,000.0 |  | 99,400,000.0 |
Short-term debt | 238,600,000 |  | 74,000,000 |
Weighted average interest rate | 0.30% |  | 0.30% |
Alagasco | Line of Credit |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Weighted average borrowings outstanding | 13,200,000 | [2] |  |
Weighted average interest rate | 1.20% | [2] |  |
Minimum borrowing outstanding | 9,000,000.0 | [2] |  |
Maximum borrowing outstanding | 16,000,000.0 | [2] |  |
Short-term debt | $ 16,000,000 | [2] |  |
Weighted average interest rate | 1.20% | [2] |  |
[1] | Represents twelve month weighted average for Laclede Group, Laclede Gas, and Alagasco.
[2] | Weighted average borrowings for Alagasco represents Laclede Group's ownership period of one month. The one month average approximates the Alagasco daily outstanding balance for the fiscal year ended September 30, 2014.

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