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LEASES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | May 26, 2021 | Sep. 30, 2020
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
ROU asset obtained in exchange for operating lease liability | $ 0 | $ 270 | $ 12,800 | $ 34,200 |  |
ROU asset obtained in exchange for finance lease liability | 0 | $ 0 | 0 | $ 49,700 |  |
Long-term debt | $ 21,400 |  | $ 21,400 |  |  | $ 74,200
Weighted average remaining lease term, operating lease | 27 years 10 months 24 days |  | 27 years 10 months 24 days |  |  | 25 years 6 months
Operating lease, discount rate | 3.30% |  | 3.30% |  |  | 3.20%
Weighted average remaining lease term, finance lease | 3 years 7 months 6 days |  | 3 years 7 months 6 days |  |  | 11 years 6 months
Finance lease, discount rate | 3.50% |  | 3.50% |  |  | 2.50%
Solar Property | Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 15 years |  | 15 years |  |  |
Renewal term | 5 years |  | 5 years |  |  |
Solar Property | Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 35 years |  | 35 years |  |  |
Renewal term | 10 years |  | 10 years |  |  |
Office Building | Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 1 year |  | 1 year |  |  |
Office Building | Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 17 years |  | 17 years |  |  |
Meter License |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 7 years |  | 7 years |  |  |
Equipment |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 5 years |  | 5 years |  |  |
Storage and Capacity |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract | 50 years |  | 50 years |  |  |
Utility Plant |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Future lease payment |  |  |  |  | $ 46,900 |
Long-term debt |  |  |  |  | $ 45,600 |

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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 http://asc.fasb.org/extlink&oid=121609121&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 http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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