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

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