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NOTES PAYABLE AND CREDIT AGREEMENTS - Narrative (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Laclede Gas | Sep. 30, 2013 Laclede Gas | Sep. 30, 2014 Line of Credit bank | Sep. 30, 2013 Line of Credit | Sep. 02, 2014 Line of Credit | Sep. 30, 2014 Line of Credit Laclede Gas bank | Sep. 30, 2014 Line of Credit Alagasco | Sep. 02, 2014 Line of Credit Alagasco bank | Sep. 03, 2014 Notes Payable to Related Party Laclede Gas | Sep. 30, 2014 Notes Payable to Related Party Laclede Gas | Sep. 30, 2013 Notes Payable to Related Party Laclede Gas | Sep. 30, 2014 Liabilities Lender Concentration Risk Line of Credit | Sep. 30, 2014 Liabilities Lender Concentration Risk Line of Credit Laclede Gas | Sep. 02, 2014 Liabilities Lender Concentration Risk Line of Credit Alagasco
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  |  |  |  |  |  |  | $ 150,000,000 | $ 450,000,000.0 |  |  |  |  |  |  |  |  |
Banks in syndicated line of credit facility |  |  |  |  |  |  | 9 |  |  | 9 |  |  | 12 |  |  |  |  |  |
Percent of debt by a singe bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.60% | 15.60% | 10.00%
Minimum required ratio of earnings before interest, taxes, depreciation, and amortization (EBITDA) times interest expense as required by the line of credit covenant. |  |  |  |  |  |  | 70.00% |  |  | 70.00% |  |  | 70.00% |  |  |  |  |  |
Debt to total capitalization ratio |  |  |  |  |  |  | 0.59 |  |  | 0.51 | 0.24 |  |  |  |  |  |  |  |
Extension period under credit agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Minimum borrowing outstanding | 0 |  | 0 |  | 45,500,000.0 | 0 | 0 | 0 |  |  | 9,000,000.0 | [1] |  |  | 0 | 0 |  |  |
Maximum borrowing outstanding | 300,500,000.0 |  | 99,400,000.0 |  | 272,100,000.0 | 160,500,000.0 | 40,000,000 | 0 |  |  | 16,000,000.0 | [1] |  |  | 189,000,000.0 | 91,700,000.0 |  |  |
Short-term debt | 287,100,000 | [2] | 74,000,000 | [2] | 238,600,000 | 120,700,000 | 32,500,000 | 0 |  |  | 16,000,000 | [1] |  |  | 0 | 46,700,000 |  |  |
Decrease in cash flow with an impact of 100 basis point interest rate increase | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | 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.
[2] | Represents twelve month weighted average for Laclede Group, Laclede Gas, and Alagasco.

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