INCOME TAXES (Details) - USD ($) $ in Millions |
Sep. 30, 2015 |
Sep. 30, 2014 |
Aug. 31, 2014 |
---|---|---|---|
Tax Credit Carryforward [Line Items] | |||
Federal and state loss carryforwards | $ 123.9 | ||
Contribution carryforwards | 11.0 | ||
Tax credit carryforwards | 2.8 | ||
Unrecognized tax benefits affect on the Company's effective tax rate | 3.1 | $ 2.5 | |
Laclede Gas | |||
Tax Credit Carryforward [Line Items] | |||
Federal and state loss carryforwards | 10.0 | ||
Contribution carryforwards | 10.9 | ||
Tax credit carryforwards | 1.5 | ||
Unrecognized tax benefits affect on the Company's effective tax rate | 2.9 | $ 2.1 | |
Alagasco | |||
Tax Credit Carryforward [Line Items] | |||
Federal and state loss carryforwards | $ 85.0 | ||
Alagasco | |||
Tax Credit Carryforward [Line Items] | |||
Percentage of voting interest acquired | 100.00% |