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Derivatives (Details) In Thousands, unless otherwise specified	Mar. 31, 2012 Derivatives designated as hedging instruments USD ($)	Mar. 31, 2012 Derivatives not designated as hedging instruments USD ($)	Mar. 31, 2012 Commodity contract (long) 2012 GAL Derivatives designated as hedging instruments USD ($) USDPerGAL	Mar. 31, 2012 Commodity contract (long) 2012 GAL Derivatives not designated as hedging instruments USD ($) USDPerGAL	Mar. 31, 2012 Commodity contract (long) 2012 MT Derivatives not designated as hedging instruments USD ($) USDPerMetricTon	Mar. 31, 2012 Commodity contract (long) 2013 GAL Derivatives not designated as hedging instruments USD ($) USDPerGAL	Mar. 31, 2012 Commodity contract (long) 2013 MT Derivatives not designated as hedging instruments USD ($) USDPerMetricTon	Mar. 31, 2012 Commodity contract (long) 2014 MT Derivatives not designated as hedging instruments USD ($) USDPerMetricTon	Mar. 31, 2012 Commodity contract (short) 2012 GAL Derivatives designated as hedging instruments USD ($) USDPerGAL	Mar. 31, 2012 Commodity contract (short) 2012 GAL Derivatives not designated as hedging instruments USD ($) USDPerGAL	Mar. 31, 2012 Commodity contract (short) 2012 MT Derivatives not designated as hedging instruments USD ($) USDPerMetricTon	Mar. 31, 2012 Commodity contract (short) 2013 GAL Derivatives not designated as hedging instruments USD ($) USDPerGAL	Mar. 31, 2012 Commodity contract (short) 2013 MT Derivatives not designated as hedging instruments USD ($) USDPerMetricTon	Mar. 31, 2012 Commodity contract (short) 2014 MT Derivatives not designated as hedging instruments USD ($) USDPerMetricTon	Mar. 31, 2012 Commodity contract inventory (short) 2012 GAL Derivatives designated as hedging instruments USD ($) USDPerGAL	Mar. 31, 2012 Commodity contract inventory (short) 2012 MT Derivatives designated as hedging instruments USD ($) USDPerMetricTon	Mar. 31, 2012 Foreign currency contracts (long) 2012 BRL Derivatives not designated as hedging instruments USD ($) USDPerBRL	Mar. 31, 2012 Foreign currency contracts (long) 2012 BRL Derivatives not designated as hedging instruments	Mar. 31, 2012 Foreign currency contracts (long) 2012 CAD Derivatives not designated as hedging instruments USD ($) USDPerCAD	Mar. 31, 2012 Foreign currency contracts (long) 2012 CAD Derivatives not designated as hedging instruments	Mar. 31, 2012 Foreign currency contracts (long) 2012 CLP Derivatives not designated as hedging instruments USD ($) USDPerCLP	Mar. 31, 2012 Foreign currency contracts (long) 2012 CLP Derivatives not designated as hedging instruments	Mar. 31, 2012 Foreign currency contracts (long) 2012 EUR Derivatives not designated as hedging instruments USD ($) USDPerEUR	Mar. 31, 2012 Foreign currency contracts (long) 2012 EUR Derivatives not designated as hedging instruments EUR (€)	Mar. 31, 2012 Foreign currency contracts (long) 2012 GBP Derivatives not designated as hedging instruments USD ($) USDPerGBP	Mar. 31, 2012 Foreign currency contracts (long) 2012 GBP Derivatives not designated as hedging instruments GBP (£)	Mar. 31, 2012 Foreign currency contracts (long) 2012 MXN Derivatives not designated as hedging instruments USD ($) USDPerMXN	Mar. 31, 2012 Foreign currency contracts (long) 2012 MXN Derivatives not designated as hedging instruments	Mar. 31, 2012 Foreign currency contracts (long) 2012 AUD Derivatives not designated as hedging instruments USD ($) USDPerAUD	Mar. 31, 2012 Foreign currency contracts (long) 2012 AUD Derivatives not designated as hedging instruments	Mar. 31, 2012 Foreign currency contracts (long) 2013 GBP Derivatives not designated as hedging instruments USD ($) USDPerGBP	Mar. 31, 2012 Foreign currency contracts (long) 2013 GBP Derivatives not designated as hedging instruments GBP (£)	Mar. 31, 2012 Foreign currency contracts (short) 2012 BRL Derivatives not designated as hedging instruments USD ($) USDPerBRL	Mar. 31, 2012 Foreign currency contracts (short) 2012 BRL Derivatives not designated as hedging instruments	Mar. 31, 2012 Foreign currency contracts (short) 2012 CAD Derivatives not designated as hedging instruments USD ($) USDPerCAD	Mar. 31, 2012 Foreign currency contracts (short) 2012 CAD Derivatives not designated as hedging instruments	Mar. 31, 2012 Foreign currency contracts (short) 2012 EUR Derivatives not designated as hedging instruments USD ($) USDPerEUR	Mar. 31, 2012 Foreign currency contracts (short) 2012 EUR Derivatives not designated as hedging instruments EUR (€)	Mar. 31, 2012 Foreign currency contracts (short) 2012 GBP Derivatives not designated as hedging instruments USD ($) USDPerGBP	Mar. 31, 2012 Foreign currency contracts (short) 2012 GBP Derivatives not designated as hedging instruments GBP (£)	Mar. 31, 2012 Foreign currency contracts (short) 2012 MXN Derivatives not designated as hedging instruments USD ($) USDPerMXN	Mar. 31, 2012 Foreign currency contracts (short) 2012 MXN Derivatives not designated as hedging instruments	Mar. 31, 2012 Foreign currency contracts (short) 2012 AUD Derivatives not designated as hedging instruments USD ($) USDPerAUD	Mar. 31, 2012 Foreign currency contracts (short) 2012 AUD Derivatives not designated as hedging instruments	Mar. 31, 2012 Foreign currency contracts (short) 2012 DKK Derivatives not designated as hedging instruments USD ($) USDPerDKK	Mar. 31, 2012 Foreign currency contracts (short) 2012 DKK Derivatives not designated as hedging instruments	Mar. 31, 2012 Foreign currency contracts (short) 2012 COP Derivatives not designated as hedging instruments USD ($) USDPerCOP	Mar. 31, 2012 Foreign currency contracts (short) 2012 COP Derivatives not designated as hedging instruments	Mar. 31, 2012 Foreign currency contracts (short) 2013 GBP Derivatives not designated as hedging instruments USD ($) USDPerGBP	Mar. 31, 2012 Foreign currency contracts (short) 2013 GBP Derivatives not designated as hedging instruments GBP (£)
Derivative instruments, at their respective fair value positions
Fair Value Hedge, Notional value of commodity contracts			992,000						3,780,000						50,384,000	72,000
Mark-to-Market Prices of fair value hedge commodity contracts			0.18						(0.08)						0.06	6.36
Mark-to-Market value of fair value hedge commodity contracts			$ 179						$ (318)						$ 2,848	$ 458
Non-Designated, Notional value of commodity contracts				128,366,000	2,678,000	4,516,000	73,000	3,000		199,585,000	2,235,000	9,670,000	31,000	6,000
Mark-to-Market Prices of non-designated commodity contracts				0.08	49.70	0.24	23.38	20.33		(0.11)	(47.07)	(0.05)	(42.23)	(11.67)
Mark-to-Market value of non-designated commodity contracts				10,610	133,103	1,106	1,707	61		(21,789)	(105,170)	(470)	(1,309)	(70)
Non-Designated, Notional amount of foreign currency contracts																		893		8,636		2,289,069		636		14,947		164,573		27		10,430		2,623		15,236		16,000		90,806		69,684		269		11,001		21,800,000		23,315
Mark-to-Market Prices of non-designated foreign currency contracts																	0.03	0.03	0.00	0.00	0.00	0.00	0.02	0.02	0.01	0.01	0.00	0.00	(0.04)	(0.04)	0.00	0.00	(0.02)	(0.02)	0.00	0.00	0.00	0.00	(0.01)	(0.01)	0.00	0.00	0.02	0.02	0.00	0.00	0.00	0.00	0.00	0.00
Mark-to-Market value of non-designated foreign currency contracts																	26		(29)		(43)		14		208		(104)		(1)		24		(63)		(11)		(50)		(1,160)		44		5		(2)		(23)		41
Mark-to-Market, Total	$ 3,167	$ 16,655

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