FAIR VALUE - HIERARCHY (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, fair value disclosure	$ 46,021		$ 50,349
Fair value, assets, Level 2 to Level 1 transfers, amount	19,564
Fair value, liabilities, Level 2 to Level 1 transfers, amount	(8,766)
Fair value, total, Level 2 to Level 1 transfers, amount	10,798
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	10,469	[1]	11,009	[1]
Other assets, fair value disclosure	211	[2]	30	[2]
Assets fair value disclosure total	56,701		61,388
Other liabilities fair value disclosure	0		0
Liabilities fair value disclosure	24,360		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	13,500		20,248
Derivative liabilities, fair value disclosure	10,450		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	32,393		29,915
Derivative liabilities, fair value disclosure	13,839		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	128		186
Derivative liabilities, fair value disclosure	71		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	10,469	[1]	11,009	[1]
Other assets, fair value disclosure	211	[2]	30	[2]
Assets fair value disclosure total	42,872		25,309
Other liabilities fair value disclosure	0		0
Liabilities fair value disclosure	13,175		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	32,192		14,270
Derivative liabilities, fair value disclosure	13,175		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	13,829		36,079
Other liabilities fair value disclosure	0		0
Liabilities fair value disclosure	11,185		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	13,500		20,248
Derivative liabilities, fair value disclosure	10,450		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	201		15,645
Derivative liabilities, fair value disclosure	664		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	128		186
Derivative liabilities, fair value disclosure	71		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] (1)Included in Other noncurrent assets on the Unaudited Condensed Consolidated Balance Sheets

[2] Includes various money market funds.