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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.