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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2021
Megawatt
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Finite-Lived Intangible Assets [Line Items]            
Number of megawatts | Megawatt 5          
Operating revenues   $ 644,027 $ 912,316 $ 1,367,594 $ 1,588,158  
Loans receivable in other noncurrent assets   35,700   35,700   $ 34,700
Financial Asset, Not Past Due            
Finite-Lived Intangible Assets [Line Items]            
Loans receivable in other current assets   14,900   $ 14,900   14,500
Minimum            
Finite-Lived Intangible Assets [Line Items]            
Loans receivable, term       2 years    
Maximum            
Finite-Lived Intangible Assets [Line Items]            
Loans receivable, term       10 years    
Energy Services            
Finite-Lived Intangible Assets [Line Items]            
Operating revenues   9,500 $ 10,300 $ 29,500 $ 32,400  
Deferred revenue   $ 77,700   $ 77,700   $ 33,800