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ACQUISITIONS AND DISPOSITIONS - Additional Information (Details)
$ in Thousands, DTH in Millions
1 Months Ended 6 Months Ended
Jan. 13, 2020
USD ($)
mi
Dec. 19, 2019
Oct. 11, 2019
USD ($)
DTH
Feb. 07, 2019
USD ($)
Nov. 30, 2017
USD ($)
Oct. 31, 2017
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Business Acquisition [Line Items]                
Payments for asset acquisitions             $ 523,647 $ 0
Gain on sale of business, net             $ 0 $ 645
Clean Energy Ventures                
Business Acquisition [Line Items]                
Disposal group consideration       $ 208,600        
Gain on sale of business, net       $ 645        
Talen's Membership Interests In IEC | Talen Generation, LLC                
Business Acquisition [Line Items]                
Cash paid related to acquisition $ 156,000       $ 10,000      
Consideration to be transferred           $ 166,000    
Contingent consideration arrangements, range of outcomes, value, high           $ 23,000    
Pipeline length owned | mi 84              
Natural gas transportation capacity agreement, period   10 years            
NJR Pipeline | Leaf River Energy Center LLC                
Business Acquisition [Line Items]                
Percentage of voting interests acquired     100.00%          
Payments for asset acquisitions     $ 367,500          
Natural gas capacity of acquiree | DTH     32.2          
Minimum | Talen's Membership Interests In IEC | Talen Generation, LLC                
Business Acquisition [Line Items]                
PP&E useful life             5 years  
Minimum | NJR Pipeline | Leaf River Energy Center LLC                
Business Acquisition [Line Items]                
PP&E useful life             5 years  
Maximum | Talen's Membership Interests In IEC | Talen Generation, LLC                
Business Acquisition [Line Items]                
PP&E useful life             30 years  
Maximum | NJR Pipeline | Leaf River Energy Center LLC                
Business Acquisition [Line Items]                
PP&E useful life             50 years