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LEASES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2022 | Jul. 31, 2021
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
ROU asset obtained in exchange for operating lease liability | $ 287 | $ 17 | $ 407 | $ 825 |  |
Proceeds from sale leaseback transactions - natural gas meters |  |  | $ 8,441 | 17,300 |  |
ROU asset obtained in exchange for finance lease liability | $ 0 | $ 0 |  |  |  |
Weighted average remaining lease term, operating lease | 29 years 1 month 6 days |  | 29 years 1 month 6 days |  | 29 years 2 months 12 days |
Operating lease, discount rate | 3.20% |  | 3.20% |  | 3.20% |
Weighted average remaining lease term, finance lease | 3 years 8 months 12 days |  | 3 years 8 months 12 days |  | 4 years |
NJNG |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Proceeds from sale leaseback transactions - natural gas meters |  |  | $ 8,400 | $ 17,300 |  |
Solar Property | Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 20 years |  | 20 years |  |  |
Renewal term | 5 years |  | 5 years |  |  |
Solar Property | Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 50 years |  | 50 years |  |  |
Renewal term | 20 years |  | 20 years |  |  |
Office Building |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract |  |  |  |  |  | 16 years
Office Building | Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 2 years |  | 2 years |  |  |
Office Building | Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 17 years |  | 17 years |  |  |
Meter License | Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 7 years |  | 7 years |  |  |
Meter License | Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 10 years |  | 10 years |  |  |
Equipment |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 8 years |  | 8 years |  |  |
Storage and Capacity |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 50 years |  | 50 years |  |  |

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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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