FAIR VALUE, HIERARCHY (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Sep. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets, Fair Value Disclosure	$ 126,990		$ 106,853
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	11,816	[1]	10,348	[1]
Other Assets, Fair Value Disclosure	4,015		2,820
Assets Fair Value Disclosure Total	142,821		120,021
Other Liabilities Fair Value Disclosure	695		616
Liabilities Fair Value Disclosure	87,504		75,655
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	11,816	[1]	10,348	[1]
Other Assets, Fair Value Disclosure	4,015		2,820
Assets Fair Value Disclosure Total	69,453		38,785
Other Liabilities Fair Value Disclosure	695		616
Liabilities Fair Value Disclosure	53,347		24,331
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	73,368		81,236
Other Liabilities Fair Value Disclosure	0		0
Liabilities Fair Value Disclosure	34,157		51,324
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
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	23,868		37,690
Derivative Liabilities, Fair Value Disclosure	14,651		11,351
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	23,868		37,690
Derivative Liabilities, Fair Value Disclosure	14,651		11,351
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
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	102,897		68,883
Derivative Liabilities, Fair Value Disclosure	72,136		63,674
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	53,622		25,617
Derivative Liabilities, Fair Value Disclosure	52,652		23,715
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	49,275		43,266
Derivative Liabilities, Fair Value Disclosure	19,484		39,959
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 - 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	225		280
Derivative Liabilities, Fair Value Disclosure	22		14
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	225		280
Derivative Liabilities, Fair Value Disclosure	22		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

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