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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

X

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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- Definition

Amount, before accumulated amortization, of right-of-use asset from finance lease.

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