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FAIR VALUE - HIERARCHY (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 36,774 $ 56,088
Available for sale equity securities - energy industry 11,192 [1] 11,716
Liabilities 83,982 42,848
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 11,192 [1] 11,716 [1]
Other 1,442 [2] 1,129 [2]
Total assets at fair value 49,408 68,933
Total liabilities at fair value 83,982 42,848
Fair Value, Measurements, Recurring [Member] | Physical Forward Commodity Contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 9,056 11,823
Liabilities 29,416 14,595
Fair Value, Measurements, Recurring [Member] | Financial Derivative Contracts - Natural Gas [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 27,716 44,249
Liabilities 54,521 28,248
Fair Value, Measurements, Recurring [Member] | Financial Derivative Contracts - Foreign Exchange [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 2 16
Liabilities 45 5
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale equity securities - energy industry 11,192 [1] 11,716 [1]
Other 1,442 [2] 1,129 [2]
Total assets at fair value 40,350 57,094
Total liabilities at fair value 54,521 28,248
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) [Member] | Physical Forward Commodity Contracts [Member]
    
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) [Member] | Financial Derivative Contracts - Natural Gas [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 27,716 44,249
Liabilities 54,521 28,248
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) [Member] | Financial Derivative Contracts - Foreign Exchange [Member]
    
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) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale equity securities - energy industry 0 [1] 0 [1]
Other 0 [2] 0 [2]
Total assets at fair value 9,058 11,839
Total liabilities at fair value 29,461 14,600
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Physical Forward Commodity Contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 9,056 11,823
Liabilities 29,416 14,595
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Financial Derivative Contracts - Natural Gas [Member]
    
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) [Member] | Financial Derivative Contracts - Foreign Exchange [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 2 16
Liabilities 45 5
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale equity securities - energy industry 0 [1] 0 [1]
Other 0 [2] 0 [2]
Total assets at fair value 0 0
Total liabilities at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Physical Forward Commodity Contracts [Member]
    
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) [Member] | Financial Derivative Contracts - Natural Gas [Member]
    
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) [Member] | Financial Derivative Contracts - Foreign Exchange [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Liabilities $ 0 $ 0
[1] Included in Other noncurrent assets on the Unaudited Condensed Consolidated Balance Sheets
[2] Includes various money market funds.