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INVESTMENTS IN EQUITY INVESTEES (Details)
$ in Thousands
3 Months Ended
Jan. 30, 2020
phase
mi
Dec. 31, 2019
USD ($)
mi
Sep. 30, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]      
Investments in equity investees   $ 202,231 $ 200,268
PennEast | NJR Pipeline      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   20.00%  
Steckman Ridge      
Schedule of Equity Method Investments [Line Items]      
Investments in equity investees   $ 113,750 114,428
Total outstanding principal balance of loans   $ 70,400 70,400
Ownership percentage   50.00%  
PennEast      
Schedule of Equity Method Investments [Line Items]      
Investments in equity investees   $ 88,481 $ 85,840
Ownership percentage   20.00%  
Construction plan, project area (in miles) | mi   120  
PennEast | Subsequent Event      
Schedule of Equity Method Investments [Line Items]      
Construction plan, project area (in miles) | mi 68    
Number of phases | phase 2    
Length of extension term 30 days