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FAIR VALUE - HIERARCHY (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Assets    
Derivative assets $ 39,245 $ 35,191
Liabilities    
Derivative liabilities 57,874 86,332
Fair Value, Measurements, Recurring    
Assets    
Available for sale equity securities 65,752 55,789
Other 1,090 1,444
Total assets at fair value 106,199 126,496
Liabilities    
Total liabilities at fair value 57,874 86,332
Fair Value, Measurements, Recurring | Physical commodity contracts    
Assets    
Derivative assets 21,866 10,216
Liabilities    
Derivative liabilities 25,371 14,026
Fair Value, Measurements, Recurring | Financial commodity contracts    
Assets    
Derivative assets 17,335 24,974
Liabilities    
Derivative liabilities 24,036 49,201
Fair Value, Measurements, Recurring | Foreign currency contracts    
Assets    
Derivative assets 44 1
Liabilities    
Derivative liabilities 0 32
Fair Value, Measurements, Recurring | Interest rate contracts    
Liabilities    
Derivative liabilities 8,467 23,073
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Available for sale equity securities 65,752 55,789
Other 1,090 1,444
Total assets at fair value 84,289 116,279
Liabilities    
Total liabilities at fair value 24,036 49,201
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Physical commodity contracts    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Financial commodity contracts    
Assets    
Derivative assets 17,335 24,974
Liabilities    
Derivative liabilities 24,036 49,201
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign currency contracts    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contracts    
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Assets    
Available for sale equity securities 0 0
Other 0 0
Total assets at fair value 21,910 10,217
Liabilities    
Total liabilities at fair value 33,838 37,131
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Physical commodity contracts    
Assets    
Derivative assets 21,866 10,216
Liabilities    
Derivative liabilities 25,371 14,026
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Financial commodity contracts    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency contracts    
Assets    
Derivative assets 44 1
Liabilities    
Derivative liabilities 0 32
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Liabilities    
Derivative liabilities 8,467 23,073
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Assets    
Available for sale equity securities 0 0
Other 0 0
Total assets at fair value 0 0
Liabilities    
Total liabilities at fair value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Physical commodity contracts    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Financial commodity contracts    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign currency contracts    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate contracts    
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Nonrecurring    
Assets    
Total assets at fair value 41,084  
Liabilities    
Acquired wholesale energy contracts 41,084  
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Total assets at fair value 0  
Liabilities    
Acquired wholesale energy contracts 0  
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)    
Assets    
Total assets at fair value 41,084  
Liabilities    
Acquired wholesale energy contracts 41,084  
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)    
Assets    
Total assets at fair value 0  
Liabilities    
Acquired wholesale energy contracts 0  
Money market funds | Fair Value, Measurements, Recurring    
Assets    
Cash and cash equivalents 112 34,072
Money market funds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Cash and cash equivalents 112 34,072
Money market funds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Assets    
Cash and cash equivalents 0 0
Money market funds | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Assets    
Cash and cash equivalents $ 0 $ 0