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EMPLOYEE BENEFIT PLANS, DEFINED CONTRIBUTION (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution, company match of employee contribution | 60.00% |  |
Defined contribution plan, maximum employer contribution by percentage of employee salary | 6.00% |  |
Defined contribution plan, cost recognized | $ 2,200,000 | $ 1,900,000 | $ 1,700,000
Deferred compensation arrangement with individual, employer contribution | $ 374,000 | $ 193,000 | $ 143,000
NJRHS [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, employer contribution for employees not qualifying for the defined benefit plan | 3.00% |  |
NJRHS [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, employer contribution for employees not qualifying for the defined benefit plan | 4.00% |  |

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- Definition Defined Contribution Plan, Company Match of Employee Contribution + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Contribution Plan, Employer Contribution For Employees Not Qualify For The Defined Benefit Plan + References No definition available. + Details
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- Definition Defined Contribution Plan, Maximum Employer Contribution by Percentage of Employee Salary + References No definition available. + Details
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Namespace Prefix: | njr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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