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COMMON STOCK EQUITY (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 03, 2015 | Mar. 02, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period (shares) |  |  | 84,356,312us-gaap_CommonStockSharesOutstanding |  | 85,400,000us-gaap_CommonStockSharesOutstanding | 42,700,000us-gaap_CommonStockSharesOutstanding
Balance as of beginning of period |  |  | $ 966,166us-gaap_StockholdersEquity |  |  |
Net income | 60,903us-gaap_NetIncomeLoss | 172,971us-gaap_NetIncomeLoss | 184,223us-gaap_NetIncomeLoss | 180,664us-gaap_NetIncomeLoss |  |
Other comprehensive income | (193)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 24us-gaap_OtherComprehensiveIncomeLossNetOfTax | 682us-gaap_OtherComprehensiveIncomeLossNetOfTax | (159)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |
Common stock issued under stock plans |  |  | 24,203njr_StockIssuedDuringPeriodValueDividendReinvestmentPlanTreasuryStockReissuedandSharebasedCompensation |  |  |
Tax benefits from stock plans |  |  | (1,386)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |  |
Cash dividend declared ($.45 per share) |  |  | (38,248)us-gaap_DividendsCash |  |  |
Treasury stock and other |  |  | 15,483us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |
Balance as of end of period (shares) | 85,459,835us-gaap_CommonStockSharesOutstanding |  | 85,459,835us-gaap_CommonStockSharesOutstanding |  | 85,400,000us-gaap_CommonStockSharesOutstanding | 42,700,000us-gaap_CommonStockSharesOutstanding
Balance as of end of period | 1,151,123us-gaap_StockholdersEquity |  | 1,151,123us-gaap_StockholdersEquity |  |  |
Cash dividend declared per share (usd per share) | $ 0.23us-gaap_CommonStockDividendsPerShareDeclared | $ 0.21us-gaap_CommonStockDividendsPerShareDeclared | $ 0.45us-gaap_CommonStockDividendsPerShareDeclared | $ 0.42us-gaap_CommonStockDividendsPerShareDeclared |  |
Common Stock [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period (shares) |  |  | 84,356,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Balance as of beginning of period |  |  | 218,223us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Common stock issued under stock plans (shares) |  |  | 1,196,000njr_StockIssuedDuringPeriodSharesDividendReinvestmentPlanTreasuryStockReissuedandSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Common stock issued under stock plans |  |  | 2,607njr_StockIssuedDuringPeriodValueDividendReinvestmentPlanTreasuryStockReissuedandSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Treasury stock and other (shares) |  |  | (92,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Balance as of end of period (shares) | 85,460,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 85,460,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Balance as of end of period | 220,830us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 220,830us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Premium on Common Stock [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period |  |  | 199,739us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Common stock issued under stock plans |  |  | 15,267njr_StockIssuedDuringPeriodValueDividendReinvestmentPlanTreasuryStockReissuedandSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Tax benefits from stock plans |  |  | (1,386)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Balance as of end of period | 213,620us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 213,620us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Accumulated Other Comprehensive (Loss) Income [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period |  |  | (5,594)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Other comprehensive income |  |  | 682us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Balance as of end of period | (4,912)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (4,912)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Treasury Stock And Other [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period |  |  | (121,031)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Common stock issued under stock plans |  |  | 6,329njr_StockIssuedDuringPeriodValueDividendReinvestmentPlanTreasuryStockReissuedandSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Treasury stock and other |  |  | 15,483us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Balance as of end of period | (99,219)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  | (99,219)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Retained Earnings [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period |  |  | 674,829us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Net income |  |  | 184,223us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Cash dividend declared ($.45 per share) |  |  | (38,248)us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Balance as of end of period | $ 820,804us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | $ 820,804us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |

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