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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	$ 35,030	$ 36,530
Overrecovered natural gas costs	14,037	26,188
Regulatory liabilities-noncurrent	193,222	196,450
Adelphia
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	269	158
Regulatory assets-noncurrent	1,911	997
Regulatory liabilities-noncurrent	223	0
NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	34,761	36,372
Regulatory assets-noncurrent	535,274	526,462
Overrecovered natural gas costs	14,037	26,188
Regulatory liabilities-noncurrent	192,999	196,286
Total current regulatory liabilities | NJNG
Regulatory Assets And Liabilities [Line Items]
Overrecovered natural gas costs	2,189	25,914
Derivatives at fair value, net | NJNG
Regulatory Assets And Liabilities [Line Items]
Overrecovered natural gas costs	11,848	274
Regulatory liabilities-noncurrent	959	352
Tax Act impact | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory liabilities-noncurrent	191,641	195,425
Other noncurrent regulatory liabilities | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory liabilities-noncurrent	399	509
New Jersey Clean Energy Program | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	18,329	15,570
Conservation Incentive Program | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	14,602	19,120
Other current regulatory assets | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-current	1,830	1,682
Regulatory assets-noncurrent	20,160	20,068
Expended, net of recoveries | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	44,333	36,516
Liability for future expenditures | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	136,882	150,590
Deferred income taxes | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	33,506	28,241
Derivatives at fair value, net | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	0	1
SAVEGREEN | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	24,929	21,281
Postemployment and other benefit costs | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	176,454	188,170
Deferred storm damage costs | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	4,886	6,515
Cost of removal | NJNG
Regulatory Assets And Liabilities [Line Items]
Regulatory assets-noncurrent	$ 94,124	$ 75,080

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Regulatory Assets And Liabilities [Line Items]

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Regulatory Assets, Noncurrent, Including Unregulated Segments

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 405
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-SubTopic 10
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