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FAIR VALUE - HIERARCHY (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Assets |  |  |  |
Other |  |  | $ 1,800 |
Liabilities |  |  |  |
Impairment of available for sale securities |  | $ 17,800 |  |
Available-for-sale |  | $ 28,200 |  |
Fair Value, Measurements, Recurring |  |  |  |
Assets |  |  |  |
Available for sale equity securities |  |  | 32,917 | $ 65,752
Other | [1] |  | 1,217 | 1,202
Total assets at fair value |  |  | 72,090 | 106,199
Liabilities |  |  |  |
Total liabilities at fair value |  |  | 69,634 | 57,874
Fair Value, Measurements, Recurring | Physical commodity contracts |  |  |  |
Assets |  |  |  |
Derivative assets |  |  | 11,682 | 21,866
Liabilities |  |  |  |
Derivative liabilities |  |  | 29,666 | 25,371
Fair Value, Measurements, Recurring | Financial commodity contracts |  |  |  |
Assets |  |  |  |
Derivative assets |  |  | 25,893 | 17,335
Liabilities |  |  |  |
Derivative liabilities |  |  | 39,724 | 24,036
Fair Value, Measurements, Recurring | Foreign currency contracts |  |  |  |
Assets |  |  |  |
Derivative assets |  |  | 0 | 44
Liabilities |  |  |  |
Derivative liabilities |  |  | 244 |
Fair Value, Measurements, Recurring | Interest rate contract |  |  |  |
Assets |  |  |  |
Derivative assets |  |  | 381 |
Liabilities |  |  |  |
Derivative liabilities |  |  |  | 8,467
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Available for sale equity securities |  |  | 32,917 | 65,752
Other | [1] |  | 1,217 | 1,202
Total assets at fair value |  |  | 53,002 | 84,289
Liabilities |  |  |  |
Total liabilities at fair value |  |  | 39,724 | 24,036
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 |  |  | 18,868 | 17,335
Liabilities |  |  |  |
Derivative liabilities |  |  | 39,724 | 24,036
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 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contract |  |  |  |
Assets |  |  |  |
Derivative assets |  |  | 0 |
Liabilities |  |  |  |
Derivative liabilities |  |  |  | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Available for sale equity securities |  |  | 0 | 0
Other | [1] |  | 0 | 0
Total assets at fair value |  |  | 19,088 | 21,910
Liabilities |  |  |  |
Total liabilities at fair value |  |  | 29,910 | 33,838
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Physical commodity contracts |  |  |  |
Assets |  |  |  |
Derivative assets |  |  | 11,682 | 21,866
Liabilities |  |  |  |
Derivative liabilities |  |  | 29,666 | 25,371
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Financial commodity contracts |  |  |  |
Assets |  |  |  |
Derivative assets |  |  | 7,025 |
Liabilities |  |  |  |
Derivative liabilities |  |  | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency contracts |  |  |  |
Assets |  |  |  |
Derivative assets |  |  | 0 | 44
Liabilities |  |  |  |
Derivative liabilities |  |  | 244 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate contract |  |  |  |
Assets |  |  |  |
Derivative assets |  |  | 381 |
Liabilities |  |  |  |
Derivative liabilities |  |  |  | 8,467
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Available for sale equity securities |  |  | 0 | 0
Other | [1] |  | 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 |
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 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate contract |  |  |  |
Assets |  |  |  |
Derivative assets |  |  | $ 0 |
Liabilities |  |  |  |
Derivative liabilities |  |  |  | $ 0
[1] | Includes money market funds.

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