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Document and Entity Information - shares
 3 Months Ended
Dec. 31, 2018
Feb. 01, 2019
Document and Entity Information [Abstract]    
Entity Registrant Name NEW JERSEY RESOURCES CORP  
Entity Central Index Key 0000356309  
Current Fiscal Year End Date --09-30  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   88,772,393
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2018  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Entity Emerging Growth Company false  
Entity Small Business false