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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2021
Megawatt
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Sep. 30, 2024
USD ($)
Finite-Lived Intangible Assets [Line Items]            
Operating revenues   $ 298,946 $ 275,636 $ 1,700,334 $ 1,400,759  
Loans receivable in other noncurrent assets   67,500   67,500   $ 53,600
BPU            
Finite-Lived Intangible Assets [Line Items]            
Number of megawatts | Megawatt 5          
Financial Asset, Not Past Due            
Finite-Lived Intangible Assets [Line Items]            
Loans receivable in other current assets   21,000   $ 21,000   18,100
Minimum            
Finite-Lived Intangible Assets [Line Items]            
Loans receivable, term       3 years    
Maximum            
Finite-Lived Intangible Assets [Line Items]            
Loans receivable, term       10 years    
ES            
Finite-Lived Intangible Assets [Line Items]            
Operating revenues   4,900 $ 9,500 $ 14,800 $ 28,500  
Deferred revenue   $ 41,800   $ 41,800   $ 22,300