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COMMITMENTS AND CONTINGENT LIABILITIES - SCHEDULE OF FUTURE COMMITTED EXPENSES (Details) (USD $) | 6 Months Ended
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Mar. 31, 2015
Long-term Purchase Commitment [Line Items] |  |
Current charges recoverable through BGSS | $ 40,600,000njr_CurrentChargesRecoverableThroughBGSS |
Natural Gas Purchases and Future Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 | 328,820,000us-gaap_PurchaseObligationDueInNextTwelveMonths / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember | [1]
2016 | 387,471,000us-gaap_PurchaseObligationDueInSecondYear / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember | [1]
2017 | 192,133,000us-gaap_PurchaseObligationDueInThirdYear / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember | [1]
2018 | 169,977,000us-gaap_PurchaseObligationDueInFourthYear / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember | [1]
2019 | 157,329,000us-gaap_OtherCommitmentDueInFifthYear / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember | [1]
Thereafter | 1,054,802,000us-gaap_PurchaseObligationDueAfterFifthYear / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember | [1]
NJRES [Member] | Natural Gas Purchases [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 | 197,232,000us-gaap_PurchaseObligationDueInNextTwelveMonths / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
2016 | 130,025,000us-gaap_PurchaseObligationDueInSecondYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
2017 | 5,059,000us-gaap_PurchaseObligationDueInThirdYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
2018 | 0us-gaap_PurchaseObligationDueInFourthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
2019 | 0us-gaap_OtherCommitmentDueInFifthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
Thereafter | 0us-gaap_PurchaseObligationDueAfterFifthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
NJRES [Member] | Storage Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 | 13,262,000us-gaap_PurchaseObligationDueInNextTwelveMonths / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
2016 | 20,746,000us-gaap_PurchaseObligationDueInSecondYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
2017 | 7,509,000us-gaap_PurchaseObligationDueInThirdYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
2018 | 4,123,000us-gaap_PurchaseObligationDueInFourthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
2019 | 2,306,000us-gaap_OtherCommitmentDueInFifthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
Thereafter | 3,383,000us-gaap_PurchaseObligationDueAfterFifthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
NJRES [Member] | Pipeline Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 | 46,374,000us-gaap_PurchaseObligationDueInNextTwelveMonths / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
2016 | 56,531,000us-gaap_PurchaseObligationDueInSecondYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
2017 | 29,550,000us-gaap_PurchaseObligationDueInThirdYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
2018 | 15,082,000us-gaap_PurchaseObligationDueInFourthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
2019 | 7,212,000us-gaap_OtherCommitmentDueInFifthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
Thereafter | 7,838,000us-gaap_PurchaseObligationDueAfterFifthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
NJRES [Member] | Natural Gas Purchases and Future Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 | 256,868,000us-gaap_PurchaseObligationDueInNextTwelveMonths / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
2016 | 207,302,000us-gaap_PurchaseObligationDueInSecondYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
2017 | 42,118,000us-gaap_PurchaseObligationDueInThirdYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
2018 | 19,205,000us-gaap_PurchaseObligationDueInFourthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
2019 | 9,518,000us-gaap_OtherCommitmentDueInFifthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
Thereafter | 11,221,000us-gaap_PurchaseObligationDueAfterFifthYear / dei_LegalEntityAxis = njr_NjresMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
NJRES [Member] | Minimum [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Storage and pipeline capacity, contract term | 1 year |
NJRES [Member] | Maximum [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Storage and pipeline capacity, contract term | 10 years |
NJNG [Member] | Natural Gas Purchases [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 | 31,306,000us-gaap_PurchaseObligationDueInNextTwelveMonths / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
2016 | 74,991,000us-gaap_PurchaseObligationDueInSecondYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
2017 | 79,203,000us-gaap_PurchaseObligationDueInThirdYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
2018 | 49,459,000us-gaap_PurchaseObligationDueInFourthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
2019 | 50,325,000us-gaap_OtherCommitmentDueInFifthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
Thereafter | 169,489,000us-gaap_PurchaseObligationDueAfterFifthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesMember |
NJNG [Member] | Storage Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 | 14,406,000us-gaap_PurchaseObligationDueInNextTwelveMonths / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
2016 | 25,762,000us-gaap_PurchaseObligationDueInSecondYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
2017 | 20,524,000us-gaap_PurchaseObligationDueInThirdYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
2018 | 14,398,000us-gaap_PurchaseObligationDueInFourthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
2019 | 9,299,000us-gaap_OtherCommitmentDueInFifthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
Thereafter | 4,649,000us-gaap_PurchaseObligationDueAfterFifthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_StorageDemandFeesMember |
NJNG [Member] | Pipeline Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 | 26,240,000us-gaap_PurchaseObligationDueInNextTwelveMonths / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
2016 | 79,416,000us-gaap_PurchaseObligationDueInSecondYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
2017 | 50,288,000us-gaap_PurchaseObligationDueInThirdYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
2018 | 86,915,000us-gaap_PurchaseObligationDueInFourthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
2019 | 88,187,000us-gaap_OtherCommitmentDueInFifthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
Thereafter | 869,443,000us-gaap_PurchaseObligationDueAfterFifthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_PipelineDemandFeesMember |
NJNG [Member] | Natural Gas Purchases and Future Demand Fees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2015 | 71,952,000us-gaap_PurchaseObligationDueInNextTwelveMonths / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
2016 | 180,169,000us-gaap_PurchaseObligationDueInSecondYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
2017 | 150,015,000us-gaap_PurchaseObligationDueInThirdYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
2018 | 150,772,000us-gaap_PurchaseObligationDueInFourthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
2019 | 147,811,000us-gaap_OtherCommitmentDueInFifthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
Thereafter | $ 1,043,581,000us-gaap_PurchaseObligationDueAfterFifthYear / dei_LegalEntityAxis = njr_NjngMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = njr_NaturalGasPurchasesAndFutureDemandFeesMember |
[1] | Does not include amounts related to intercompany asset management agreements between NJRES and NJNG.

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- Definition Minimum amount of other commitment maturing in the fifth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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