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DEBT - LONG TERM DEBT (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jan. 26, 2018
Aug. 18, 2017
Debt Instrument [Line Items]        
Payments of long-term debt $ 1,690 $ 2,716    
Proceeds from sale-leaseback transaction 7,820 9,587    
Natural Gas Distribution        
Debt Instrument [Line Items]        
Proceeds from sale-leaseback transaction 7,800 9,600    
Sale leaseback transaction, other payments required $ 1,100 $ 1,000    
Credit Agreement Due August 16, 2019 | Term Loan        
Debt Instrument [Line Items]        
Senior notes       $ 100,000
Subsequent Event | Credit Agreement Due August 16, 2019 | Term Loan        
Debt Instrument [Line Items]        
Weighted average interest rate at end of period     2.84%