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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | ---
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-current |  | $ 17,906 | $ 18,297
Regulatory assets-noncurrent |  | 376,420 | 368,592
Regulatory liabilities-current |  | 3,717 | 8,185
Regulatory liabilities-noncurrent |  | 208,869 | 209,139
Conservation Incentive Program |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory liabilities-current |  | 0 | 6,994
Derivatives at fair value, net |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory liabilities-current |  | 3,717 | 1,191
Tax Act impact |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory liabilities-noncurrent | [1] | 202,912 | 205,410
New Jersey Clean Energy Program |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory liabilities-noncurrent |  | 4,198 | 1,902
Other noncurrent regulatory liabilities |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory liabilities-noncurrent |  | 1,759 | 1,827
New Jersey Clean Energy Program |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-current |  | 5,772 | 14,052
Underrecovered gas costs |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-current |  | 12,093 | 4,137
Conservation Incentive Program |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-current |  | 40 | 0
Derivatives at fair value, net |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-current |  | 1 | 108
Regulatory assets-noncurrent |  | 9 | 0
Expended, net of recoveries |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 31,436 | 33,017
Liability for future expenditures |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 128,897 | 130,800
Deferred income taxes |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 18,499 | 17,225
SAVEGREEN |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 5,570 | 8,636
Postemployment and other benefit costs |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 135,316 | 136,716
Deferred storm damage costs |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 9,772 | 10,858
Cost of removal |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 37,847 | 22,339
Other noncurrent regulatory assets |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | $ 9,074 | $ 9,001
[1] | Reflects the re-measurement and subsequent amortization of NJNG's net deferred tax liabilities as a result of the change in federal tax rates enacted in the Tax Act.

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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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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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