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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SOFTWARE COSTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Capitalized software costs $ 4,707 $ 1,702
Software amortization 63  
Operation and maintenance    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Software costs 6,720 9,062
Depreciation and amortization    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Software costs 284 0
Utility plant, at cost    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Software costs 13,452 0
Construction work in progress    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Software costs 0 4,778
Nonutility plant and equipment, at cost    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Software costs 316 0
Accumulated depreciation and amortization, utility plant    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated depreciation and amortization 279 0
Accumulated depreciation and amortization, nonutility plant and equipment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated depreciation and amortization $ 5 $ 0