FAIR VALUE - HIERARCHY (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value disclosure	$ 42,933		$ 50,349
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	11,563	[1]	11,009	[1]
Other assets, fair value disclosure	36	[2]	30	[2]
Assets fair value disclosure total	54,532		61,388
Other liabilities fair value disclosure	0		0
Liabilities fair value disclosure	47,835		45,573
Fair Value, Measurements, Recurring [Member] | Physical Forward Commodity Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value disclosure	10,730		20,248
Derivative liabilities, fair value disclosure	4,722		9,746
Fair Value, Measurements, Recurring [Member] | Financial Commodity Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value disclosure	32,132		29,915
Derivative liabilities, fair value disclosure	43,087		35,715
Fair Value, Measurements, Recurring [Member] | Financial commodity contracts - foreign exchange [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value disclosure	71		186
Derivative liabilities, fair value disclosure	26		112
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, fair value disclosure	11,563	[1]	11,009	[1]
Other assets, fair value disclosure	36	[2]	30	[2]
Assets fair value disclosure total	43,597		25,309
Other liabilities fair value disclosure	0		0
Liabilities fair value disclosure	43,087		16,922
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) [Member] | Physical Forward Commodity Contracts [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
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) [Member] | Financial Commodity Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value disclosure	31,998		14,270
Derivative liabilities, fair value disclosure	43,087		16,922
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets, (Level 1) [Member] | Financial commodity contracts - foreign exchange [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
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [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	[2]	0	[2]
Assets fair value disclosure total	10,935		36,079
Other liabilities fair value disclosure	0		0
Liabilities fair value disclosure	4,748		28,651
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Physical Forward Commodity Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value disclosure	10,730		20,248
Derivative liabilities, fair value disclosure	4,722		9,746
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Financial Commodity Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value disclosure	134		15,645
Derivative liabilities, fair value disclosure	0		18,793
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Financial commodity contracts - foreign exchange [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value disclosure	71		186
Derivative liabilities, fair value disclosure	26		112
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [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	[2]	0	[2]
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] | Significant Unobservable Inputs (Level 3) [Member] | Physical Forward Commodity Contracts [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
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Financial Commodity Contracts [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
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Financial commodity contracts - foreign exchange [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

[1] Included in Other noncurrent assets on the Unaudited Condensed Consolidated Balance Sheets

[2] Includes various money market funds.