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ACQUISITION (Details)
$ in Thousands
9 Months Ended
Nov. 07, 2017
USD ($)
Oct. 27, 2017
USD ($)
mi
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]        
Payment made at closing     $ 10,000 $ 0
Talen Generation, LLC | Talen's Membership Interests In IEC        
Business Acquisition [Line Items]        
Pipeline length owned | mi   84    
Natural gas transportation capacity agreement, period   10 years    
Adelphia | Talen Generation, LLC | Talen's Membership Interests In IEC        
Business Acquisition [Line Items]        
Consideration to be transferred   $ 166,000    
Contingent consideration arrangements, additional consideration   $ 23,000    
Payment made at closing $ 10,000