FAIR VALUE, HIERARCHY (Details) (USD $) In Thousands	Sep. 30, 2011		Sep. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Fair Value Disclosure	$ 106,853		$ 143,143
Physical Forward Commodity Contracts [Member] | Fair Value, Inputs, 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] | Fair Value, 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	37,690		24,048
Derivative Liabilities, Fair Value Disclosure	11,351		6,058
Physical Forward Commodity Contracts [Member] | Fair Value, 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
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	37,690		24,048
Derivative Liabilities, Fair Value Disclosure	11,351		6,058
Financial Commodity Contracts [Member] | Fair Value, Inputs, 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	25,617		58,824
Derivative Liabilities, Fair Value Disclosure	23,715		38,497
Financial Commodity Contracts [Member] | Fair Value, 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	43,266		60,246
Derivative Liabilities, Fair Value Disclosure	39,959		39,532
Financial Commodity Contracts [Member] | Fair Value, 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 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Fair Value Disclosure	68,883		119,070
Derivative Liabilities, Fair Value Disclosure	63,674		78,029
Financial commodity contracts - foreign exchange [Member] | Fair Value, Inputs, 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
Financial commodity contracts - foreign exchange [Member] | Fair Value, 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	280		25
Derivative Liabilities, Fair Value Disclosure	14
Financial commodity contracts - foreign exchange [Member] | Fair Value, 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
Derivative Liabilities, Fair Value Disclosure	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	280		25
Derivative Liabilities, Fair Value Disclosure	14
Fair Value, Inputs, 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			10,290	[1]
Other Assets, Fair Value Disclosure	2,820		947
Assets Fair Value Disclosure Total	38,785		70,061
Other Liabilities Fair Value Disclosure	616		936
Liabilities Fair Value Disclosure	24,331		39,433
Fair Value, 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		0
Assets Fair Value Disclosure Total	81,236		84,319
Other Liabilities Fair Value Disclosure	0		0
Liabilities Fair Value Disclosure	51,324		45,590
Fair Value, 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		0
Assets Fair Value Disclosure Total	0		0
Other Liabilities Fair Value Disclosure	0		0
Liabilities Fair Value Disclosure	0		0
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	10,348	[1]	10,290	[1]
Other Assets, Fair Value Disclosure	2,820		947
Assets Fair Value Disclosure Total	120,021		154,380
Other Liabilities Fair Value Disclosure	616		936
Liabilities Fair Value Disclosure	$ 75,655		$ 85,023

[1] Included in other noncurrent assets in the Consolidated Balance Sheets.