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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - GAS IN STORAGE (Details) $ in Thousands	Dec. 31, 2018 USD ($) Bcf	Sep. 30, 2018 USD ($) Bcf
Inventory [Line Items]
Gas in Storage, value | $	$ 241,389	$ 184,633
Gas in Storage, Bcf | Bcf	59.2	59.0
Energy Services
Inventory [Line Items]
Gas in Storage, value | $	$ 148,746	$ 90,166
Gas in Storage, Bcf | Bcf	38.4	34.1
Natural Gas Distribution
Inventory [Line Items]
Gas in Storage, value | $	$ 92,643	$ 94,467
Gas in Storage, Bcf | Bcf	20.8	24.9

X

- Definition

Natural Gas in Storage Nonmonetary Number of Billion Cubic Feet of Gas in Storage as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	njr_EnergyRelatedInventoryNaturalGasinStorageBCF
Namespace Prefix:	njr_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of natural gas in storage, which is a mixture of gases (liquefied or otherwise), used for fuel and manufacturing purposes, which is ready for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: