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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NATURAL GAS IN STORAGE (Details) $ in Thousands	Jun. 30, 2021 USD ($) Bcf	Sep. 30, 2020 USD ($) Bcf
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 125,824	$ 167,504
Natural Gas in Storage, Bcf | Bcf	39.6	61.52
Natural Gas Distribution
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 68,657	$ 110,037
Natural Gas in Storage, Bcf | Bcf	17.4	27.2
Energy Services
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 57,167	$ 57,352
Natural Gas in Storage, Bcf | Bcf	22.2	34.3
Storage and Transportation
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 0	$ 115
Natural Gas in Storage, Bcf | Bcf	0	0.02

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

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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=120391452&loc=d3e13212-122682

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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.

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- Details

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- Details

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- Details

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