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FINANCING ARRANGEMENTS (Details) |  | 3 Months Ended
--- | --- | ---
Dec. 14, 2016 USD ($) bank borrower agreement | Dec. 31, 2016
Line of Credit Facility [Line Items] |  |
Number of terminated loan agreements | agreement | 3 |
Debt covenant, short-term debt to capital requirement, maximum | 70.00% |
Line of Credit | Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Number of banks in loan agreement | bank | 11 |
Maximum borrowing capacity | $ 975,000,000.0 |
Number of borrowers under loan agreement | borrower | 3 |
Line of Credit | Revolving Credit Facility | Spire |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ 300,000,000.0 |
Ratio of short-term debt to total capital |  | 0.59
Line of Credit | Revolving Credit Facility | Laclede Gas |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | 475,000,000.0 |
Ratio of short-term debt to total capital |  | 0.51
Line of Credit | Revolving Credit Facility | Alagasco |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ 200,000,000.0 |
Ratio of short-term debt to total capital |  | 0.29
Line of Credit | Revolving Credit Facility | Credit Availability Concentration Risk |  |
Line of Credit Facility [Line Items] |  |
Concentration risk |  | 12.30%

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