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INVESTMENTS IN EQUITY INVESTEES (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2015
USD ($)
mi
Sep. 30, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]    
Investments in equity investees $ 134,280 $ 132,002
Steckman Ridge [Member]    
Schedule of Equity Method Investments [Line Items]    
Investments in equity investees [1] 125,058 125,649
Steckman Ridge [Member] | Equity Method Investee [Member]    
Schedule of Equity Method Investments [Line Items]    
Total outstanding principal balance of loans 70,400 70,400
PennEast [Member]    
Schedule of Equity Method Investments [Line Items]    
Investments in equity investees $ 9,222 $ 6,353
Construction plan, project area (in miles) | mi 118  
[1] Includes loans with a total outstanding principal balance of $70.4 million for both December 31, 2015 and September 30, 2015. The loans accrue interest at a variable rate that resets quarterly and are due October 1, 2023.