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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
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Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | $ 56,866 | $ 32,871
Regulatory assets-noncurrent | 450,039 | 496,637
Regulatory liabilities-noncurrent | 199,737 | 202,435
Tax Act impact |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 197,928 | 200,417
New Jersey Clean Energy Program |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 1,318 | 197
Other noncurrent regulatory liabilities |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 491 | 1,821
New Jersey Clean Energy Program |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 5,868 | 15,468
Under-recovered gas costs |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 9,246 | 9,506
Conservation Incentive Program |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 23,481 | 3,371
Derivatives at fair value, net |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 16,231 | 4,526
Regulatory assets-noncurrent | 0 | 486
Expended, net of recoveries |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 35,856 | 38,351
Liability for future expenditures |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 128,868 | 131,080
Deferred income taxes |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 21,049 | 19,631
SAVEGREEN |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 12,101 | 10,201
Postemployment and other benefit costs |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 165,577 | 212,461
Deferred storm damage costs |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 7,601 | 8,687
Cost of removal |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 62,488 | 65,660
Other regulatory assets (liabilities) |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 2,040 | 0
Regulatory assets-noncurrent | $ 16,499 | $ 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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- 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 -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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