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LEASES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands |  | 12 Months Ended
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Aug. 14, 2020 | Sep. 30, 2020
Lessee, Lease, Description [Line Items] |  |
ROU asset obtained in exchange for operating lease liability |  | $ 76,600
ROU asset obtained in exchange for finance lease liability |  | $ 49,700
Weighted average remaining lease term, operating lease |  | 25 years 6 months
Weighted average remaining lease term, finance lease |  | 11 years 6 months
Operating lease, discount rate |  | 3.18%
Finance lease, discount rate |  | 2.50%
Leaf River Energy Center LLC |  |
Lessee, Lease, Description [Line Items] |  |
Lease, partial termination amount | $ 28,500 |
Non-compete agreement period | 50 years |
Solar Property | Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Term of contract |  | 15 years
Renewal term |  | 5 years
Solar Property | Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Term of contract |  | 35 years
Renewal term |  | 10 years
Office Building | Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Term of contract |  | 1 year
Office Building | Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Term of contract |  | 25 years
Meter License |  |
Lessee, Lease, Description [Line Items] |  |
Term of contract |  | 7 years
Equipment |  |
Lessee, Lease, Description [Line Items] |  |
Term of contract |  | 5 years
Storage and Capacity |  |
Lessee, Lease, Description [Line Items] |  |
Term of contract |  | 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 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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- Definition Discount rate used by lessee to determine present value of finance lease payments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Discount rate used by lessee to determine present value of operating lease payments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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