Derivatives and Fair Value of Financial Instruments (Details 3) (USD $)	1 Months Ended
	Sep. 29, 2012 item	Aug. 28, 2010	May 29, 2010 item	Dec. 31, 2011 item
Net commodity purchase contracts | Grain
Derivative commodity instruments
Nonmonetary notional amount	9,929,000
Net commodity purchase contracts | Soybean oil
Derivative commodity instruments
Nonmonetary notional amount				2,580,000
Net commodity purchase contracts | Soybean meal
Derivative commodity instruments
Nonmonetary notional amount				23,300
Net commodity purchase contracts | Hogs
Derivative commodity instruments
Nonmonetary notional amount				2,280,000
Net commodity purchase contracts | Sugar
Derivative commodity instruments
Nonmonetary notional amount	17,652,000
Net commodity purchase contracts | Whey powder
Derivative commodity instruments
Nonmonetary notional amount	220,000
Net commodity sale contracts | Grain
Derivative commodity instruments
Nonmonetary notional amount				10,599,000
Net commodity sale contracts | Soybean meal
Derivative commodity instruments
Nonmonetary notional amount	82,000
Net commodity sale contracts | Hogs
Derivative commodity instruments
Nonmonetary notional amount	13,400,000
Net commodity sale contracts | Heating oil
Derivative commodity instruments
Nonmonetary notional amount	2,310,000			1,176,000
Foreign currency exchange agreements
Derivative commodity instruments
Notional amounts	$ 218,127,000			$ 158,266,000
Interest rate exchange agreements
Derivative commodity instruments
Notional amounts	75,000,000	25,000,000	25,000,000	100,000,000
Number of derivative agreements entered	3		3	4
Number of derivative agreements terminated	1
Term of derivative contract		10 years	10 years
Payment to terminate derivative agreement	$ 3,861,000