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FAIR VALUE, HIERARCHY (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Assets, Fair Value Disclosure [Abstract]    
Derivative assets $ 69,877 $ 56,088
Available-for-sale securities 10,700 [1] 11,700 [1]
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 86,553 42,848
Fair Value, Measurements, Recurring [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 10,672 [1] 11,716 [1]
Other 1,299 [2] 1,129 [2]
Total assets at fair value 81,848 68,933
Liabilities, Fair Value Disclosure [Abstract]    
Total liabilities at fair value 86,553 42,848
Fair Value, Measurements, Recurring [Member] | Physical Forward Commodity Contracts [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 15,426 11,823
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 30,910 14,595
Fair Value, Measurements, Recurring [Member] | Financial Commodity Contracts - Natural Gas [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 54,451 44,249
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 55,488 28,248
Fair Value, Measurements, Recurring [Member] | Foreign Currency Contract [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets   16
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 155 5
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 10,672 [1] 11,716 [1]
Other 1,299 [2] 1,129 [2]
Total assets at fair value 66,422 57,094
Liabilities, Fair Value Disclosure [Abstract]    
Total liabilities at fair value 55,488 28,248
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 54,451 44,249
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 55,488 28,248
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Currency Contract [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets   0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 0 [1] 0 [1]
Other 0 [2] 0 [2]
Total assets at fair value 15,426 11,839
Liabilities, Fair Value Disclosure [Abstract]    
Total liabilities at fair value 31,065 14,600
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Physical Forward Commodity Contracts [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets 15,426 11,823
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 30,910 14,595
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] | Foreign Currency Contract [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets   16
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities 155 5
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 0 [1] 0 [1]
Other 0 [2] 0 [2]
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] | Foreign Currency Contract [Member]
    
Assets, Fair Value Disclosure [Abstract]    
Derivative assets   0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative liabilities $ 0 $ 0
[1] Included in other noncurrent assets on the Consolidated Balance Sheets.
[2] Includes various money market funds in Level 1.