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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCOUNTS RECEIVABLE BY SUBSIDIARY (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
accounts receivable by subsidiary [Line Items]    
Billed $ 314,139us-gaap_AccountsReceivableGrossCurrent $ 189,970us-gaap_AccountsReceivableGrossCurrent
Receivable by Subsidiary, percentage 100.00%njr_ReceivableBySubsidiaryPercentage 100.00%njr_ReceivableBySubsidiaryPercentage
Unbilled revenues 48,172us-gaap_UnbilledReceivablesCurrent 7,231us-gaap_UnbilledReceivablesCurrent
NJRES [Member]    
accounts receivable by subsidiary [Line Items]    
Billed 236,564us-gaap_AccountsReceivableGrossCurrent
/ dei_LegalEntityAxis
= njr_NjresMember		 142,566us-gaap_AccountsReceivableGrossCurrent
/ dei_LegalEntityAxis
= njr_NjresMember
Receivable by Subsidiary, percentage 75.00%njr_ReceivableBySubsidiaryPercentage
/ dei_LegalEntityAxis
= njr_NjresMember		 75.00%njr_ReceivableBySubsidiaryPercentage
/ dei_LegalEntityAxis
= njr_NjresMember
NJNG [Member]    
accounts receivable by subsidiary [Line Items]    
Billed 74,198us-gaap_AccountsReceivableGrossCurrent
/ dei_LegalEntityAxis
= njr_NjngMember		 [1] 41,281us-gaap_AccountsReceivableGrossCurrent
/ dei_LegalEntityAxis
= njr_NjngMember		 [1]
Receivable by Subsidiary, percentage 24.00%njr_ReceivableBySubsidiaryPercentage
/ dei_LegalEntityAxis
= njr_NjngMember		 22.00%njr_ReceivableBySubsidiaryPercentage
/ dei_LegalEntityAxis
= njr_NjngMember
NJRCEV [Member]    
accounts receivable by subsidiary [Line Items]    
Billed 725us-gaap_AccountsReceivableGrossCurrent
/ dei_LegalEntityAxis
= njr_NjrcevMember		 594us-gaap_AccountsReceivableGrossCurrent
/ dei_LegalEntityAxis
= njr_NjrcevMember
Receivable by Subsidiary, percentage 0.00%njr_ReceivableBySubsidiaryPercentage
/ dei_LegalEntityAxis
= njr_NjrcevMember		 0.00%njr_ReceivableBySubsidiaryPercentage
/ dei_LegalEntityAxis
= njr_NjrcevMember
NJRHS and Other [Member]    
accounts receivable by subsidiary [Line Items]    
Billed $ 2,652us-gaap_AccountsReceivableGrossCurrent
/ dei_LegalEntityAxis
= njr_NjrhsAndOtherMember		 $ 5,529us-gaap_AccountsReceivableGrossCurrent
/ dei_LegalEntityAxis
= njr_NjrhsAndOtherMember
Receivable by Subsidiary, percentage 1.00%njr_ReceivableBySubsidiaryPercentage
/ dei_LegalEntityAxis
= njr_NjrhsAndOtherMember		 3.00%njr_ReceivableBySubsidiaryPercentage
/ dei_LegalEntityAxis
= njr_NjrhsAndOtherMember
[1] Does not include unbilled revenues of $48.2 million and $7.2 million as of December 31, 2014 and September 30, 2014, respectively.