Derivatives and Fair Value of Financial Instruments (Details 3) (USD $)	1 Months Ended
	Sep. 29, 2012 item	Aug. 28, 2010	May 29, 2010 item	Mar. 30, 2013 item	Dec. 31, 2012 item
Net commodity purchase contracts | Grain
Derivative commodity instruments
Nonmonetary notional amount				14,359,000	15,403,000
Net commodity purchase contracts | Sugar
Derivative commodity instruments
Nonmonetary notional amount				27,776,000	28,896,000
Net commodity purchase contracts | Cheese
Derivative commodity instruments
Nonmonetary notional amount				40,000	120,000
Net commodity sale contracts | Soybean meal
Derivative commodity instruments
Nonmonetary notional amount				41,000	53,000
Net commodity sale contracts | Hogs
Derivative commodity instruments
Nonmonetary notional amount				19,880,000	21,080,000
Net commodity sale contracts | Heating oil
Derivative commodity instruments
Nonmonetary notional amount				1,764,000	546,000
Net commodity sale contracts | Dry whey powder
Derivative commodity instruments
Nonmonetary notional amount					220,000
Foreign currency exchange agreements
Derivative commodity instruments
Notional amounts				$ 199,417,000	$ 243,563,000
Interest rate exchange agreements
Derivative commodity instruments
Notional amounts	25,000,000	25,000,000	25,000,000	75,000,000	75,000,000
Number of derivative agreements entered			3	3	3
Number of derivative agreements terminated	1
Term of derivative contract		10 years	10 years
Payment to terminate derivative agreement	$ 3,861,000