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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

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