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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 |  |  |

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