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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets-current | $ 36,530 | $ 32,871
Regulatory assets-noncurrent | 527,459 | 496,637
Regulatory Liabilities [Line Items] |  |
Regulatory liability-current | 26,188 | 0
Regulatory liabilities-noncurrent | 196,450 | 202,435
Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-current | 36,372 | 32,871
Regulatory assets-noncurrent | 526,462 | 496,637
Regulatory Liabilities [Line Items] |  |
Regulatory liability-current | 26,188 | 0
Regulatory liabilities-noncurrent | 196,286 | 202,435
Overrecovered natural gas costs | Natural Gas Distribution |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liability-current | 25,914 | 0
Derivatives at fair value, net | Natural Gas Distribution |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liability-current | 274 | 0
Regulatory liabilities-noncurrent | 352 | 0
Tax Act impact | Natural Gas Distribution |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 195,425 | 200,417
New Jersey Clean Energy Program | Natural Gas Distribution |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 0 | 197
Other noncurrent regulatory liabilities | Natural Gas Distribution |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 509 | 1,821
New Jersey Clean Energy Program | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-current | 15,570 | 15,468
Conservation Incentive Program | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-current | 19,120 | 3,371
Underrecovered natural gas costs | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-current | 0 | 9,506
Derivatives at fair value, net | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-current | 0 | 4,526
Regulatory assets-noncurrent | 1 | 486
Other current regulatory assets | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-current | 1,682 | 0
Environmental remediation costs, Expended, net of recoveries |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 36,500 |
Environmental remediation costs, Expended, net of recoveries | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 36,516 | 38,351
Environmental remediation costs, Liability for future expenditures |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 150,600 | 131,100
Environmental remediation costs, Liability for future expenditures | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 150,590 | 131,080
Deferred income taxes | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 28,241 | 19,631
SAVEGREEN | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 21,281 | 10,201
Postemployment and other benefit costs | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 188,170 | 212,461
Deferred storm damage costs | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 6,515 | 8,687
Cost of removal | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | 75,080 | 65,660
Other noncurrent regulatory assets | Natural Gas Distribution |  |
Regulatory Assets [Line Items] |  |
Regulatory assets-noncurrent | $ 20,068 | $ 10,080

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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