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INVESTMENTS IN EQUITY INVESTEES, EQUITY METHOD INVESTMENTS (Details)
$ in Thousands
3 Months Ended
Sep. 30, 2014
mi
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]      
Investments in equity investees   $ 141,148 $ 132,002
Steckman Ridge      
Schedule of Equity Method Investments [Line Items]      
Investments in equity investees [1]   123,155 125,649
Steckman Ridge | Equity Method Investee      
Schedule of Equity Method Investments [Line Items]      
Outstanding principal balance   70,400 70,400
PennEast      
Schedule of Equity Method Investments [Line Items]      
Investments in equity investees   $ 17,993 $ 6,353
Construction plan, pipeline distance (in miles) | mi 118    
[1] Includes loans with a total outstanding principal balance of $70.4 million for both fiscal 2016 and 2015, which accrue interest at a variable rate that resets quarterly and are due October 1, 2023.