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STOCK-BASED COMPENSATION - NARRATIVE (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Proceeds from exercise of stock options       $ 0   $ 724,000  
Performance Shares, Market Condition Award              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)       44,576      
Performance Shares, Subject to Performance Conditions              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)       51,931 69,305 61,576  
Deferred compensation related to unvested performance shares, period       1 year 8 months 12 days      
Performance share awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted but not issued (in shares)       156,587 179,916 214,464 247,536
Number of shares granted (in shares)       96,507 115,480 102,790  
Deferred compensation related to unvested restricted and performance shares       $ 2,900,000      
Weighted average grant date fair value (in dollars per share)       $ 33.57 $ 27.37 $ 28.25  
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted but not issued (in shares)       51,154 73,071 81,492 41,491
Number of shares granted (in shares)       28,734 41,909 61,972  
Deferred compensation related to unvested restricted and performance shares       $ 511,409      
Deferred compensation related to unvested performance shares, period       2 years      
Weighted average grant date fair value (in dollars per share)       $ 35.79 $ 30.03 $ 29.41  
Vesting September 30, 2019 | Performance Shares, Subject to Performance Conditions              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)       25,806      
Vesting Annually Over Three Year Period Beginning September 30, 2017 | Performance Shares, Subject to Performance Conditions              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)       26,125      
Award vesting period       3 years      
Vesting September 2017 | Performance Shares, Market Condition Award              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)         46,175    
Vesting September 2017 | Performance Shares, Subject to Performance Conditions              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted and expected to be distributed (in shares)         38,789    
Vesting Annually Over a Three Year Period Beginning in September 2015 | Performance Shares, Subject to Performance Conditions              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted and expected to be distributed (in shares)         30,516    
Award vesting period           3 years  
Vesting Annually Over Three Year Period Beginning October 15, 2017 | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)       22,591      
Award vesting period       3 years      
Vesting Annually Over Three Year Period Beginning May 8, 2018 | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)       6,143      
Vesting Annually Over Three Year Period Beginning October 2016 | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)         41,909    
Award vesting period         3 years    
Vesting September 2016 | Performance Shares, Market Condition Award              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)           41,214  
Vesting September 2016 | Performance Shares, Subject to Performance Conditions              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted and expected to be distributed (in shares)           34,622  
Vesting Annually Over a Three Year Period Beginning in September 2014 | Performance Shares, Subject to Performance Conditions              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted and expected to be distributed (in shares)           26,954  
Vesting Annually Over a Three Year Period Beginning in October 2015 | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)           48,542  
Award vesting period           3 years  
Vesting October 2015 | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)           10,236  
Vesting September 2015 | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares)           3,194  
Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for future issuance (in shares)       3,119,878.1      
Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation costs not yet recognized       $ 280,000      
Director | Scheduled to Vest Immediately              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted (in shares) 27,972 27,481 26,122        
Weighted average grant date fair value (in dollars per share) $ 35.59 $ 32.75 $ 30.63        
NJR 2007 Stock Award And Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted but not issued (in shares)         914,169    
NJR 2017 Stock Award And Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Additional shares authorized for issuance (in shares)       3,135,000