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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PROPERTY PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 01, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Property Classifications        
Total property, plant and equipment   $ 4,997,049 $ 4,464,966  
Accumulated depreciation and amortization   (783,536) (742,197)  
Property, plant and equipment, net   4,213,513 3,722,769  
Utility | Distribution facilities        
Property Classifications        
Total property, plant and equipment   $ 2,558,651 2,309,039  
Utility | Distribution facilities | Minimum        
Property Classifications        
Useful Lives   38 years    
Utility | Distribution facilities | Maximum        
Property Classifications        
Useful Lives   74 years    
Utility | Transmission facilities        
Property Classifications        
Total property, plant and equipment   $ 643,942 332,947  
Utility | Transmission facilities | Minimum        
Property Classifications        
Useful Lives   35 years    
Utility | Transmission facilities | Maximum        
Property Classifications        
Useful Lives   56 years    
Utility | Storage facilities        
Property Classifications        
Total property, plant and equipment   $ 79,892 79,922  
Utility | Storage facilities | Minimum        
Property Classifications        
Useful Lives   34 years    
Utility | Storage facilities | Maximum        
Property Classifications        
Useful Lives   47 years    
Nonutility | Solar property        
Property Classifications        
Total property, plant and equipment   $ 675,376 $ 665,233  
Nonutility | Solar property | Minimum        
Property Classifications        
Useful Lives 15 years 15 years 15 years 15 years
Nonutility | Solar property | Maximum        
Property Classifications        
Useful Lives 35 years 35 years 25 years 25 years
Nonutility | Storage and transportation property        
Property Classifications        
Total property, plant and equipment   $ 433,678 $ 428,491  
Nonutility | Storage and transportation property | Minimum        
Property Classifications        
Useful Lives   5 years    
Nonutility | Storage and transportation property | Maximum        
Property Classifications        
Useful Lives   50 years    
Nonutility | All other property        
Property Classifications        
Total property, plant and equipment   $ 57,968 92,932  
Nonutility | All other property | Minimum        
Property Classifications        
Useful Lives   5 years    
Nonutility | All other property | Maximum        
Property Classifications        
Useful Lives   35 years    
Nonutility | Construction work in progress        
Property Classifications        
Total property, plant and equipment   $ 547,542 $ 556,402