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COMMON STOCK EQUITY - NARRATIVE (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Equity raised through the DRP waiver discount feature	$ 8.0	$ 22.7
Shares issued through the DRP waiver discount feature (in shares)	168	554
Equity raised through the DRP	$ 3.7	$ 3.8
Number of treasury shares issued from raising of equity through the DRP	82	90

X

- Definition

Proceeds From Issuance Of Common Stock, Dividend Reinvestment Plan Waiver Discount Feature

+ References

No definition available.

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X

- Definition

Number of shares issued during the period from a DRP waiver discount feature.

+ References

No definition available.

+ Details

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Namespace Prefix:	njr_
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X

- References

No definition available.

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X

- Definition

Amount of cash inflow from capital contributions to an entity associated with a dividend reinvestment plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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X

- Definition

Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

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