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ACQUISITIONS AND DISPOSITIONS - Additional Information (Details)
$ in Thousands, DTH in Millions
1 Months Ended 9 Months Ended
Jan. 13, 2020
USD ($)
mi
Dec. 19, 2019
Oct. 11, 2019
USD ($)
DTH
Nov. 30, 2017
USD ($)
Oct. 31, 2017
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Business Acquisition [Line Items]              
Payments for asset acquisitions           $ 523,647 $ 0
Talen's Membership Interests In IEC | Talen Generation, LLC              
Business Acquisition [Line Items]              
Pipeline length owned | mi 84            
Consideration to be transferred         $ 166,000    
Cash paid related to acquisition $ 156,000     $ 10,000      
Contingent consideration arrangements, range of outcomes, value, high         $ 23,000    
Natural gas transportation capacity agreement, period   10 years          
Leaf River Energy Center LLC | NJR Pipeline              
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 | Leaf River Energy Center LLC | NJR Pipeline              
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 | Leaf River Energy Center LLC | NJR Pipeline              
Business Acquisition [Line Items]              
PP&E useful life           50 years