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Derivatives (Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2014
Dec. 28, 2013
Derivatives, Fair Value [Line Items]    
Asset Derivatives Fair Value $ 1,511 $ 30,028
Liability Derivatives Fair Value 2,538 3
Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives Fair Value 16 2,469
Liability Derivatives Fair Value 696 1
Designated as Hedging Instrument [Member] | Corn Option [Member] | Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives Fair Value 16 2,349
Designated as Hedging Instrument [Member] | Corn Option [Member] | Accrued Expenses [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives Fair Value 696 1
Designated as Hedging Instrument [Member] | Natural Gas Swap [Member] | Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives Fair Value 0 120
Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives Fair Value 1,495 27,559
Liability Derivatives Fair Value 1,842 2
Not Designated as Hedging Instrument [Member] | Corn Option [Member] | Accrued Expenses [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives Fair Value 166 0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives Fair Value 1,449 27,516
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accrued Expenses [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives Fair Value 1,671 0
Not Designated as Hedging Instrument [Member] | Heating Oil Swaps And Options [Member] | Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives Fair Value 18 43
Not Designated as Hedging Instrument [Member] | Heating Oil Swaps And Options [Member] | Accrued Expenses [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives Fair Value 5 2
Not Designated as Hedging Instrument [Member] | Soybean Oil Options [Member] | Other Current Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives Fair Value $ 28 $ 0