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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
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Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-current | $ 46,216 | $ 73,070
Regulatory assets-noncurrent | 615,859 | 609,192
Regulatory liability-current | 29,152 | 32,981
Regulatory liabilities-noncurrent | 171,688 | 175,847
Expended, net of recoveries |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 70,500 |
NJNG |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-current | 46,216 | 73,070
Regulatory assets-noncurrent | 610,866 | 604,097
Regulatory liability-current | 25,615 | 32,457
Regulatory liabilities-noncurrent | 171,688 | 175,847
NJNG | Overrecovered natural gas costs |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory liability-current | 12,561 | 32,457
NJNG | Derivatives at fair value, net |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory liability-current | 13,054 | 0
Regulatory liabilities-noncurrent | 0 | 404
NJNG | Tax Act impact |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 171,564 | 175,328
NJNG | Other noncurrent regulatory liabilities |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 124 | 115
NJNG | New Jersey Clean Energy Program |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-current | 18,688 | 18,491
NJNG | Conservation Incentive Program |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-current | 25,957 | 51,442
NJNG | Derivatives at fair value, net |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-current | 0 | 1,363
NJNG | Other current regulatory assets |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-current | 1,571 | 1,774
Regulatory assets-noncurrent | 57,946 | 59,924
NJNG | Expended, net of recoveries |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 70,512 | 77,475
NJNG | Liability for future expenditures |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 155,861 | 161,650
NJNG | Deferred income taxes |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 44,516 | 42,595
NJNG | SAVEGREEN |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 122,996 | 107,796
NJNG | Postemployment and other benefit costs |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 26,541 | 23,772
NJNG | Cost of removal |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 132,494 | 130,885
Adelphia |  |
Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 4,993 | 5,095
Regulatory liability-current | $ 3,537 | $ 524

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- Definition 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 -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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- Definition 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. + 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 -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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