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Document and Entity Information
 3 Months Ended
Dec. 31, 2012
Feb. 05, 2013
Document Information [Line Items]    
Entity Registrant Name NEW JERSEY RESOURCES CORP  
Entity Central Index Key 0000356309  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer Yes  
Current Fiscal Year End Date --09-30  
Entity Common Stock, Shares Outstanding   41,810,073
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2012  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q1  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer