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RATES AND REGULATORY ACTIONS (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended
Oct. 01, 2014
Sep. 30, 2014
Jan. 31, 2015
Schedule of Capitalization [Line Items]      
Approved base rate increase $ 20.0sji_PublicUtilitiesApprovedBaseRateIncrease    
Rate of return on base rate 7.10%sji_PublicUtilitiesRateOfReturnOnBaseRate    
Return on common equity 9.75%sji_PublicUtilitiesReturnOnCommonEquity    
Depreciate rate 2.10%sji_PublicUtilitiesDepreciateRate 2.40%sji_PublicUtilitiesDepreciateRate  
Accelerated Infrastructure Replacement Program      
Schedule of Capitalization [Line Items]      
Approved base rate increase 7.5sji_PublicUtilitiesApprovedBaseRateIncrease
/ sji_ScheduleOfRateMattersAxis
= sji_AcceleratedInfrastructureReplacementProgramMember		    
Energy Efficiency Tracker      
Schedule of Capitalization [Line Items]      
Amount of regulatory costs approved, statewide     $ 56.0sji_AmountOfRegulatoryCostsApprovedStatewide
/ sji_ScheduleOfRateMattersAxis
= sji_EnergyEfficiencyTrackerMember