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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