Derivatives (Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	$ 2,879	$ 30,028
Liability Derivatives Fair Value	1,042	3
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	761	2,469
Liability Derivatives Fair Value	18	1
Designated as Hedging Instrument [Member] | Corn Option [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	761	2,349
Designated as Hedging Instrument [Member] | Corn Option [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	0	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
Designated as Hedging Instrument [Member] | Natural Gas Swap [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	18	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	2,118	27,559
Liability Derivatives Fair Value	1,024	2
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	2,052	27,516
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	986	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	51	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	38	2
Not Designated as Hedging Instrument [Member] | Corn options and futures [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	$ 15	$ 0