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FAIR VALUE, HIERARCHY (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative assets |  | $ 45,087 | $ 69,877
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 38,330 | 86,553
Fair Value, Measurements, Recurring [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available for sale equity securities - energy industry | [1] | 59,475 | 10,672
Other | [2] | 1,572 | 1,299
Total assets at fair value |  | 106,134 | 81,848
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Total liabilities at fair value |  | 38,330 | 86,553
Fair Value, Measurements, Recurring [Member] | Physical Forward Commodity Contracts [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative assets |  | 6,572 | 15,426
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 9,281 | 30,910
Fair Value, Measurements, Recurring [Member] | Financial Commodity Contracts - Natural Gas [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative assets |  | 38,515 | 54,451
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 24,821 | 55,488
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member] |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 4,228 |
Fair Value, Measurements, Recurring [Member] | Foreign Currency Contracts [Member] |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  |  | 155
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available for sale equity securities - energy industry | [1] | 59,475 | 10,672
Other | [2] | 1,572 | 1,299
Total assets at fair value |  | 99,562 | 66,422
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Total liabilities at fair value |  | 24,821 | 55,488
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Physical Forward Commodity Contracts [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative assets |  | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Financial Commodity Contracts - Natural Gas [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative assets |  | 38,515 | 54,451
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 24,821 | 55,488
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Contract [Member] |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 0 |
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Currency Contracts [Member] |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  |  | 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available for sale equity securities - energy industry | [1] | 0 | 0
Other | [2] | 0 | 0
Total assets at fair value |  | 6,572 | 15,426
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Total liabilities at fair value |  | 13,509 | 31,065
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Physical Forward Commodity Contracts [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative assets |  | 6,572 | 15,426
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 9,281 | 30,910
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Financial Commodity Contracts - Natural Gas [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative assets |  | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contract [Member] |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 4,228 |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Currency Contracts [Member] |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  |  | 155
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available for sale equity securities - energy industry | [1] | 0 | 0
Other | [2] | 0 | 0
Total assets at fair value |  | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Total liabilities at fair value |  | 0 | 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Physical Forward Commodity Contracts [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative assets |  | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Financial Commodity Contracts - Natural Gas [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative assets |  | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | 0 | 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Contract [Member] |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  | $ 0 |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Foreign Currency Contracts [Member] |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |
Derivative liabilities |  |  | $ 0
[1] | Included in other noncurrent assets on the Consolidated Balance Sheets.
[2] | Includes various money market funds in Level 1.

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