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FAIR VALUE - HIERARCHY (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ 53,875 | $ 35,191
Liabilities | 97,607 | 86,332
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale equity securities - energy industry | 64,447 | 55,789
Other | 33,614 | 35,516
Total assets at fair value | 151,936 | 126,496
Total liabilities at fair value | 97,607 | 86,332
Fair Value, Measurements, Recurring [Member] | Physical commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 8,850 | 10,216
Liabilities | 7,247 | 14,026
Fair Value, Measurements, Recurring [Member] | Financial commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 45,025 | 24,974
Liabilities | 87,567 | 49,201
Fair Value, Measurements, Recurring [Member] | Foreign currency contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  | 1
Liabilities | 91 | 32
Fair Value, Measurements, Recurring [Member] | Interest rate contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 2,702 | 23,073
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale equity securities - energy industry | 64,447 | 55,789
Other | 33,614 | 35,516
Total assets at fair value | 143,086 | 116,279
Total liabilities at fair value | 87,567 | 49,201
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) | Physical commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) | Financial commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 45,025 | 24,974
Liabilities | 87,567 | 49,201
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) | Foreign currency contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  | 0
Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) | Interest rate contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale equity securities - energy industry | 0 | 0
Other | 0 | 0
Total assets at fair value | 8,850 | 10,217
Total liabilities at fair value | 10,040 | 37,131
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Physical commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 8,850 | 10,216
Liabilities | 7,247 | 14,026
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Financial commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Foreign currency contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  | 1
Liabilities | 91 | 32
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Interest rate contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 2,702 | 23,073
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available for sale equity securities - energy industry | 0 | 0
Other | 0 | 0
Total assets at fair value | 0 | 0
Total liabilities at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Physical commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Financial commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Foreign currency contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  | 0
Liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Interest rate contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | $ 0 | $ 0

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