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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NATURAL GAS IN STORAGE (Details) $ in Thousands	Jun. 30, 2025 USD ($) Bcf	Sep. 30, 2024 USD ($) Bcf
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 168,157	$ 199,125
Natural Gas in Storage, Bcf | Bcf	36,600,000	43,900,000
NJNG
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 131,098	$ 177,655
Natural Gas in Storage, Bcf | Bcf	22,700,000	30,800,000
ES
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 36,530	$ 21,378
Natural Gas in Storage, Bcf | Bcf	13,700,000	13,100,000
S&T
Inventory [Line Items]
Natural Gas in Storage, value | $	$ 528	$ 92
Natural Gas in Storage, Bcf | Bcf	200,000	0

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_
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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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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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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