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INVESTMENTS IN EQUITY METHOD INVESTEES (Details)
$ in Thousands
 6 Months Ended
Mar. 31, 2017
USD ($)
Investor
mi
Sep. 30, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]    
Investments in equity investees $ 152,891 $ 141,148
Steckman Ridge    
Schedule of Equity Method Investments [Line Items]    
Investments in equity investees 121,809 123,155
Steckman Ridge | Equity Method Investee    
Schedule of Equity Method Investments [Line Items]    
Total outstanding principal balance of loans 70,400 70,400
PennEast    
Schedule of Equity Method Investments [Line Items]    
Investments in equity investees $ 31,082 $ 17,993
Number of investors in pipeline construction and operation | Investor 5  
Construction plan, project area (in miles) | mi 120