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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting [Abstract]        
Consolidated net financial earnings $ 99,143njr_NetFinancialEarningsLoss $ 151,920njr_NetFinancialEarningsLoss $ 154,253njr_NetFinancialEarningsLoss $ 191,780njr_NetFinancialEarningsLoss
Unrealized loss (gain) from derivative instruments and related transactions 68,474njr_UnrealizedGainLossfromDerivativeInstrumentsandRelatedTransactions (13,256)njr_UnrealizedGainLossfromDerivativeInstrumentsandRelatedTransactions (20,198)njr_UnrealizedGainLossfromDerivativeInstrumentsandRelatedTransactions 52,395njr_UnrealizedGainLossfromDerivativeInstrumentsandRelatedTransactions
Effects of economic hedging related to natural gas inventory (23,450)njr_EffectsofEconomicHedgingRelatedtoNaturalGasInventory (18,668)njr_EffectsofEconomicHedgingRelatedtoNaturalGasInventory (32,215)njr_EffectsofEconomicHedgingRelatedtoNaturalGasInventory (41,548)njr_EffectsofEconomicHedgingRelatedtoNaturalGasInventory
Tax adjustments (6,784)njr_TaxesRelatedToAdjustmentsUsedToReconcileNetFinancialEarningsToNetIncome 10,873njr_TaxesRelatedToAdjustmentsUsedToReconcileNetFinancialEarningsToNetIncome 22,443njr_TaxesRelatedToAdjustmentsUsedToReconcileNetFinancialEarningsToNetIncome 269njr_TaxesRelatedToAdjustmentsUsedToReconcileNetFinancialEarningsToNetIncome
NET INCOME $ 60,903us-gaap_NetIncomeLoss $ 172,971us-gaap_NetIncomeLoss $ 184,223us-gaap_NetIncomeLoss $ 180,664us-gaap_NetIncomeLoss