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REVENUE - TIMING OF REVENUE RECOGNITION (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2021 USD ($)
Timing of Revenue Recognition [Roll Forward]
Billed, beginning	$ 134,173
Unbilled, beginning	9,226
Customers' credit, beginning	25,934
Increase (decrease) for accounts receivable, billed	71,309
Increase (decrease) for unbilled revenue	3,437
Increase (decrease) for customers' credits	(3,235)
Billed, end	205,482
Unbilled, end	12,663
Customers' credit, end	$ 22,699

X

- Definition

Contract with Customer, Increase (Decrease) for Accounts Receivable

+ References

No definition available.

+ Details

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Namespace Prefix:	njr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Contract with Customer, Increase (Decrease) for Contract Liability

+ References

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+ Details

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Namespace Prefix:	njr_
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X

- Definition

Contract with Customer, Increase (Decrease) for Unbilled Receivable

+ References

No definition available.

+ Details

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Namespace Prefix:	njr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Timing of Revenue Recognition [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	njr_
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X

- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4531-111522

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

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-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044

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X

- Definition

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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