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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SOFTWARE COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Capitalized software costs $ 5,560   $ 5,560   $ 4,707
Software amortization 147 $ 0 335 $ 0  
Operation and maintenance          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Software costs 2,039 1,928 6,810 4,524  
Depreciation and amortization          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Software costs 273 $ 0 796 $ 0  
Utility plant, at cost          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Software costs 14,127   14,127   13,452
Construction work in progress          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Software costs 2,496   2,496   0
Nonutility plant and equipment, at cost          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Software costs 334   334   316
Accumulated depreciation and amortization, utility plant          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Accumulated depreciation and amortization (1,057)   (1,057)   (279)
Accumulated depreciation and amortization, nonutility plant and equipment          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Accumulated depreciation and amortization $ (23)   $ (23)   $ (5)