Derivatives (Details 2)	Jun. 30, 2011 Bushel Gallon Ton
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	4,000
Corn [Member] | Non-exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	0
Corn [Member] | Exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	0
Soybeans [Member] | Non-exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	18,716,000
Soybeans [Member] | Exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	0
Wheat [Member] | Non-exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	12,881,000
Wheat [Member] | Exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	0
Oats [Member] | Non-exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	0
Oats [Member] | Exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	0
Soymeal [Member] | Non-exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	0
Soymeal [Member] | Exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	0
Ethanol [Member] | Non-exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	0
Ethanol [Member] | Exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	0
Other Commodity [Member] | Non-exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	663,000
Other Commodity [Member] | Exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	120,000
Non-exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	202,013,000
Exchange traded [Member]
Commodity Derivative Contract Quantity Disclosure [Abstract]
Nonmonetary Notional Amount of Price Risk Derivative Instruments Not Designated as Hedging Instruments	188,265,000