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STOCK-BASED COMPENSATION - NARRATIVE (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for future issuance (in shares) |  | 3,473,061.93 |  |  |
Performance Shares, Market Condition Award |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 31,836 | 44,576 | 46,175 |
Performance Shares, Subject to Performance Conditions |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 59,341 | 51,931 | 69,305 |
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) | [1] | 145,176 | 156,587 | 179,916 | 214,464
Deferred compensation related to unvested restricted and performance shares |  | $ 3,800,000 |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 44,168 | 51,154 | 73,071 | 81,492
Deferred compensation related to unvested restricted and performance shares |  | $ 612,964 |  |  |
Deferred compensation related to unvested performance shares, period |  | 2 years |  |  |
Vesting September 30, 2020 | Performance Shares, Subject to Performance Conditions |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 29,608 |  |  |
Vesting Annually Over Three Year Period Beginning September 30, 2018 | Performance Shares, Subject to Performance Conditions |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 29,733 |  |  |
Award vesting period |  | 3 years |  |  |
Vesting September 30, 2019 | Performance Shares, Subject to Performance Conditions |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (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] |  |  |  |  |
Shares granted but not issued (in shares) |  |  | 26,125 |  |
Award vesting period |  |  | 3 years |  |
Vesting September 30, 2018 | Performance Shares, Subject to Performance Conditions |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  |  |  | 38,789 |
Vesting Annually Over Three Year Period Beginning September 30, 2016 | Performance Shares, Subject to Performance Conditions |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  |  |  | 30,516 |
Award vesting period |  |  |  | 3 years |
Vesting Annually Over Three Year Period Beginning October 15, 2018 | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 27,949 |  |  |
Award vesting period |  | 3 years |  |  |
Vesting Annually Over Three Year Period Beginning October 2017 | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (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] |  |  |  |  |
Shares granted but not issued (in shares) |  |  | 6,143 |  |
Award vesting period |  |  | 3 years |  |
Vesting Annually Over a Three Year Period Beginning in October 2016 | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  |  |  | 41,909 |
Award vesting period |  |  |  | 3 years |
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 |  |  |
[1] | The number of common shares issued related to certain performance shares may range from zero to 150 percent of the number of shares shown in the table above based on the Company’s achievement of performance goals.

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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