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FAIR VALUE, HIERARCHY (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | $ 56,088 |  | $ 50,349 |
Derivative Liabilities, Fair Value Disclosure | 42,848 |  | 45,573 |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 11,716 | [1] | 11,009 | [1]
Other Assets, Fair Value Disclosure | 1,129 | [2] | 30 | [2]
Assets Fair Value Disclosure Total | 68,933 |  | 61,388 |
Other Liabilities Fair Value Disclosure | 0 |  | 0 |
Liabilities Fair Value Disclosure | 42,848 |  | 45,573 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 11,716 | [1] | 11,009 | [1]
Other Assets, Fair Value Disclosure | 1,129 | [2] | 30 | [2]
Assets Fair Value Disclosure Total | 57,094 |  | 25,309 |
Other Liabilities Fair Value Disclosure | 0 |  | 0 |
Liabilities Fair Value Disclosure | 28,248 |  | 16,922 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 0 | [1] | 0 | [1]
Other Assets, Fair Value Disclosure | 0 | [2] | 0 | [2]
Assets Fair Value Disclosure Total | 11,839 |  | 36,079 |
Other Liabilities Fair Value Disclosure | 0 |  | 0 |
Liabilities Fair Value Disclosure | 14,600 |  | 28,651 |
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 0 | [1] | 0 | [1]
Other Assets, Fair Value Disclosure | 0 | [2] | 0 | [2]
Assets Fair Value Disclosure Total | 0 |  | 0 |
Other Liabilities Fair Value Disclosure | 0 |  | 0 |
Liabilities Fair Value Disclosure | 0 |  | 0 |
Physical Forward Commodity Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 11,823 |  | 20,248 |
Derivative Liabilities, Fair Value Disclosure | 14,595 |  | 9,746 |
Physical Forward Commodity Contracts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 0 |  | 0 |
Derivative Liabilities, Fair Value Disclosure | 0 |  | 0 |
Physical Forward Commodity Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 11,823 |  | 20,248 |
Derivative Liabilities, Fair Value Disclosure | 14,595 |  | 9,746 |
Physical Forward Commodity Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 0 |  | 0 |
Derivative Liabilities, Fair Value Disclosure | 0 |  | 0 |
Financial Commodity Contracts - Natural Gas [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 44,249 |  | 29,915 |
Derivative Liabilities, Fair Value Disclosure | 28,248 |  | 35,715 |
Financial Commodity Contracts - Natural Gas [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 44,249 |  | 14,270 |
Derivative Liabilities, Fair Value Disclosure | 28,248 |  | 16,922 |
Financial Commodity Contracts - Natural Gas [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 0 |  | 15,645 |
Derivative Liabilities, Fair Value Disclosure | 0 |  | 18,793 |
Financial Commodity Contracts - Natural Gas [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 0 |  | 0 |
Derivative Liabilities, Fair Value Disclosure | 0 |  | 0 |
Financial Commodity Contracts - Foreign Exchange [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 16 |  | 186 |
Derivative Liabilities, Fair Value Disclosure | 5 |  | 112 |
Financial Commodity Contracts - Foreign Exchange [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 0 |  | 0 |
Derivative Liabilities, Fair Value Disclosure | 0 |  | 0 |
Financial Commodity Contracts - Foreign Exchange [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 16 |  | 186 |
Derivative Liabilities, Fair Value Disclosure | 5 |  | 112 |
Financial Commodity Contracts - Foreign Exchange [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets, Fair Value Disclosure | 0 |  | 0 |
Derivative Liabilities, Fair Value Disclosure | $ 0 |  | $ 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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