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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	$ 76,728	$ 73,587
Regulatory assets-noncurrent	581,907	584,830
Regulatory liability-current	30,344	32,287
Regulatory liabilities-noncurrent	179,638	180,458
Expended, net of recoveries
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	67,100
NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	76,728	73,587
Regulatory assets-noncurrent	576,710	579,599
Regulatory liability-current	28,579	30,637
Regulatory liabilities-noncurrent	179,638	180,458
NJNG | Overrecovered natural gas costs
Regulatory Assets And Liabilities [Line Items]
Regulatory liability-current	28,579	30,637
NJNG | Tax Act impact
Regulatory Assets And Liabilities [Line Items]
Regulatory liabilities-noncurrent	179,093	180,347
NJNG | Other noncurrent regulatory liabilities
Regulatory Assets And Liabilities [Line Items]
Regulatory liabilities-noncurrent	545	111
NJNG | New Jersey Clean Energy Program
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	14,382	15,804
NJNG | Conservation Incentive Program
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	47,819	50,356
NJNG | Derivatives at fair value, net
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	13,215	6,017
NJNG | Other current regulatory assets
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	1,312	1,410
Regulatory assets-noncurrent	48,710	51,019
NJNG | Expended, net of recoveries
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	67,065	66,298
NJNG | Liability for future expenditures
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	165,315	169,390
NJNG | Deferred income taxes
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	42,028	41,667
NJNG | SAVEGREEN
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	83,486	83,589
NJNG | Postemployment and other benefit costs
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	54,904	55,274
NJNG | Cost of removal
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	115,202	112,362
Adelphia
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	5,197	5,231
Regulatory liability-current	$ 1,765	$ 1,650

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- Definition

Regulatory Assets And Liabilities [Line Items]

+ References

No definition available.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
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The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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