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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Jun. 01, 2015
Derivatives, Fair Value [Line Items]      
Fixed treasury rate     3.26%
Notional amount of foreign currency derivatives     $ 125,000
Asset Derivatives, current $ 30,081 $ 29,964  
Asset Derivatives, noncurrent 9,164 5,227  
Asset Derivatives 39,245 35,191  
Liability Derivatives, current 46,544 61,080  
Liability Derivatives, noncurrent 11,330 25,252  
Liability Derivatives 57,874 86,332  
Physical commodity contracts | Natural Gas Distribution | Derivatives not designated as hedging instruments:      
Derivatives, Fair Value [Line Items]      
Asset Derivatives, current 151 235  
Liability Derivatives, current 72 1,154  
Physical commodity contracts | Energy Services | Derivatives not designated as hedging instruments:      
Derivatives, Fair Value [Line Items]      
Asset Derivatives, current 14,588 5,994  
Asset Derivatives, noncurrent 7,127 3,987  
Liability Derivatives, current 16,589 11,660  
Liability Derivatives, noncurrent 8,710 1,212  
Financial commodity contracts | Natural Gas Distribution | Derivatives not designated as hedging instruments:      
Derivatives, Fair Value [Line Items]      
Asset Derivatives, current 0 805  
Asset Derivatives, noncurrent 0 75  
Liability Derivatives, current 1,149 2,979  
Liability Derivatives, noncurrent 0 386  
Financial commodity contracts | Energy Services | Derivatives not designated as hedging instruments:      
Derivatives, Fair Value [Line Items]      
Asset Derivatives, current 15,302 22,929  
Asset Derivatives, noncurrent 2,033 1,165  
Liability Derivatives, current 20,267 45,255  
Liability Derivatives, noncurrent 2,620 581  
Interest rate contracts | Natural Gas Distribution | Derivatives not designated as hedging instruments:      
Derivatives, Fair Value [Line Items]      
Asset Derivatives, current 0 0  
Asset Derivatives, noncurrent 0 0  
Liability Derivatives, current 8,467 0  
Liability Derivatives, noncurrent 0 23,073  
Foreign currency contracts      
Derivatives, Fair Value [Line Items]      
Notional amount of foreign currency derivatives 4,500    
Foreign currency contracts | Energy Services | Derivatives not designated as hedging instruments:      
Derivatives, Fair Value [Line Items]      
Asset Derivatives, current 40 1  
Asset Derivatives, noncurrent 4 0  
Liability Derivatives, current 0 32  
Liability Derivatives, noncurrent 0 $ 0  
Series LL | Natural Gas Distribution      
Derivatives, Fair Value [Line Items]      
Long-term debt $ 125,000    
Stated interest rate 5.60%