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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
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting [Abstract]    
Consolidated net financial earnings $ 55,109njr_NetFinancialEarningsLoss $ 39,860njr_NetFinancialEarningsLoss
Unrealized (gain) loss from derivative instruments and related transactions (88,673)njr_UnrealizedGainLossfromDerivativeInstrumentsandRelatedTransactions 65,652njr_UnrealizedGainLossfromDerivativeInstrumentsandRelatedTransactions
Effects of economic hedging related to natural gas inventory (8,765)njr_EffectsofEconomicHedgingRelatedtoNaturalGasInventory (22,880)njr_EffectsofEconomicHedgingRelatedtoNaturalGasInventory
Tax adjustments 29,227njr_TaxesRelatedToAdjustmentsUsedToReconcileNetFinancialEarningsToNetIncome (10,605)njr_TaxesRelatedToAdjustmentsUsedToReconcileNetFinancialEarningsToNetIncome
NET INCOME $ 123,320us-gaap_NetIncomeLoss $ 7,693us-gaap_NetIncomeLoss