FAIR VALUE, HIERARCHY (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Sep. 30, 2015
Assets
Derivative assets		$ 35,191	$ 45,087
Liabilities
Derivative liabilities		86,332	38,330
Fair Value, Measurements, Recurring
Assets
Available for sale equity securities - energy industry		55,789	59,475
Other	[1]	35,516	1,572
Total assets at fair value		126,496	106,134
Liabilities
Total liabilities at fair value		86,332	38,330
Fair Value, Measurements, Recurring | Physical commodity contracts
Assets
Derivative assets		10,216	6,572
Liabilities
Derivative liabilities		14,026	9,281
Fair Value, Measurements, Recurring | Financial commodity contracts
Assets
Derivative assets		24,974	38,515
Liabilities
Derivative liabilities		49,201	24,821
Fair Value, Measurements, Recurring | Foreign currency contracts
Assets
Derivative assets		1
Liabilities
Derivative liabilities		32
Fair Value, Measurements, Recurring | Interest rate contracts
Liabilities
Derivative liabilities		23,073	4,228
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Available for sale equity securities - energy industry		55,789	59,475
Other	[1]	35,516	1,572
Total assets at fair value		116,279	99,562
Liabilities
Total liabilities at fair value		49,201	24,821
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Physical commodity contracts
Assets
Derivative assets		0	0
Liabilities
Derivative liabilities		0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Financial commodity contracts
Assets
Derivative assets		24,974	38,515
Liabilities
Derivative liabilities		49,201	24,821
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign currency contracts
Assets
Derivative assets		0
Liabilities
Derivative liabilities		0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contracts
Liabilities
Derivative liabilities		0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Available for sale equity securities - energy industry		0	0
Other	[1]	0	0
Total assets at fair value		10,217	6,572
Liabilities
Total liabilities at fair value		37,131	13,509
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Physical commodity contracts
Assets
Derivative assets		10,216	6,572
Liabilities
Derivative liabilities		14,026	9,281
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Financial commodity contracts
Assets
Derivative assets		0	0
Liabilities
Derivative liabilities		0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency contracts
Assets
Derivative assets		1
Liabilities
Derivative liabilities		32
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate contracts
Liabilities
Derivative liabilities		23,073	4,228
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Available for sale equity securities - energy industry		0	0
Other	[1]	0	0
Total assets at fair value		0	0
Liabilities
Total liabilities at fair value		0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Physical commodity contracts
Assets
Derivative assets		0	0
Liabilities
Derivative liabilities		0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Financial commodity contracts
Assets
Derivative assets		0	0
Liabilities
Derivative liabilities		0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign currency contracts
Assets
Derivative assets		0
Liabilities
Derivative liabilities		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate contracts
Liabilities
Derivative liabilities		$ 0	$ 0

[1] Includes various money market funds.