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COMMITMENTS AND CONTINGENCIES - Leases and Guarantees (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Loss Contingencies [Line Items]      
Outstanding mortgage loans incurred in connection with various real estate ventures with general partners $ 1.5    
Laclede Gas      
Loss Contingencies [Line Items]      
Office headquarters lease rental aggregate expense 2.8 $ 1.0 $ 1.0
Minimum rental costs obligations - in fiscal year 2016 3.8    
Laclede Gas | Vehicles and Power Operated Equipment Leases      
Loss Contingencies [Line Items]      
Minimum rental costs obligations - in fiscal year 2016 2.2    
Minimum rental costs obligations - due in fiscal year 2017 2.5    
Minimum rental costs obligations - due in fiscal year 2018 $ 0.1