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Derivatives (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 29, 2013 | Jun. 30, 2012 | Jun. 29, 2013 | Jun. 30, 2012 | Dec. 29, 2012 | Jun. 29, 2013 Designated as Hedging Instrument [Member] | Dec. 29, 2012 Designated as Hedging Instrument [Member] | Jun. 29, 2013 Not Designated as Hedging Instrument [Member] | Dec. 29, 2012 Not Designated as Hedging Instrument [Member] | Jun. 29, 2013 Natural Gas Swap [Member] | Jun. 30, 2012 Natural Gas Swap [Member] | Jun. 29, 2013 Natural Gas Swap [Member] | Jun. 30, 2012 Natural Gas Swap [Member] | Jun. 29, 2013 Natural Gas Swap [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member] | Dec. 29, 2012 Natural Gas Swap [Member] Designated as Hedging Instrument [Member] Accrued Expenses [Member] | Jun. 29, 2013 Natural Gas Swap [Member] Designated as Hedging Instrument [Member] Other Current Assets [Member] | Dec. 29, 2012 Natural Gas Swap [Member] Designated as Hedging Instrument [Member] Other Current Assets [Member] | Jun. 29, 2013 Natural Gas Swap [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member] | Dec. 31, 2011 Natural Gas Swap [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member] | Jun. 29, 2013 Heating Oil Swaps And Options [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member] | Dec. 29, 2012 Heating Oil Swaps And Options [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member] | Jun. 29, 2013 Heating Oil Swaps And Options [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member] | Dec. 29, 2012 Heating Oil Swaps And Options [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member] | Jun. 29, 2013 Corn Option [Member] | Jun. 30, 2012 Corn Option [Member] | Jun. 29, 2013 Corn Option [Member] | Jun. 30, 2012 Corn Option [Member] | Jun. 29, 2013 Corn Option [Member] Designated as Hedging Instrument [Member] Other Current Assets [Member] | Dec. 29, 2012 Corn Option [Member] Designated as Hedging Instrument [Member] Other Current Assets [Member] | Jun. 29, 2013 Corn Option [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member] | Dec. 29, 2012 Corn Option [Member] Not Designated as Hedging Instrument [Member] Accrued Expenses [Member] | Jun. 29, 2013 Corn options and futures [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member] | Dec. 29, 2012 Corn options and futures [Member] Not Designated as Hedging Instrument [Member] Other Current Assets [Member] | Jun. 29, 2013 Forward Contracts [Member] Commodity Contract [Member] | Jun. 29, 2013 Cash Flow Hedging [Member] | Dec. 31, 2010 Cash Flow Hedging [Member] Interest Rate Swap [Member] | Jun. 29, 2013 Cash Flow Hedging [Member] Interest Rate Swap [Member] | Jun. 30, 2012 Cash Flow Hedging [Member] Interest Rate Swap [Member] | Jun. 29, 2013 Cash Flow Hedging [Member] Interest Rate Swap [Member] | Jun. 30, 2012 Cash Flow Hedging [Member] Interest Rate Swap [Member] | May 19, 2006 Cash Flow Hedging [Member] Interest Rate Swap [Member] derivative | Jun. 29, 2013 Cash Flow Hedging [Member] Natural Gas Swap [Member] | Jun. 30, 2012 Cash Flow Hedging [Member] Natural Gas Swap [Member] | Jun. 29, 2013 Cash Flow Hedging [Member] Natural Gas Swap [Member] | Jun. 30, 2012 Cash Flow Hedging [Member] Natural Gas Swap [Member] | Jun. 29, 2013 Cash Flow Hedging [Member] Corn Option [Member] | Jun. 30, 2012 Cash Flow Hedging [Member] Corn Option [Member] | Jun. 29, 2013 Cash Flow Hedging [Member] Corn Option [Member] | Jun. 30, 2012 Cash Flow Hedging [Member] Corn Option [Member]
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Interest Rate Derivatives Held |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for Cash Flow Hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount reclassified from accumulated other comprehensive loss into earnings over next 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedge Loss Reclassified to Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Derivatives Fair Value | 2,722,000 |  |  |  | 2,722,000 |  |  |  | 722,000 | 2,688,000 | 501,000 | 34,000 | 221,000 |  |  |  |  |  |  |  |  |  |  |  |  | 31,000 | 104,000 |  |  |  |  |  |  |  |  | 3,000 | 117,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 290,000 |  |  |  | 290,000 |  |  |  | 144,000 | 116,000 | 21,000 | 174,000 | 123,000 |  |  |  |  | 116,000 | 21,000 | 0 | 11,000 | 28,000 | 0 | 146,000 | 4,000 |  |  |  |  |  |  | 2,688,000 | 490,000 | 0 | 119,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | 1,353,000 | [1] | 217,000 | [1] | 3,128,000 | [2] | (483,000) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] | 0 | [2] | 0 | [2] |  | (97,000) | [1] | 217,000 | [1] | 87,000 | [2] | (483,000) | [2] | 1,450,000 | [1] | 0 | [1] | 3,041,000 | [2] | 0 | [2]
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 1,110,000 | [3] | (323,000) | [3] | 1,095,000 | [3] | (1,268,000) | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [3] | (28,000) | [3] | 0 | [3] | (260,000) | [3] |  | 244,000 | [3] | (295,000) | [3] | 187,000 | [3] | (1,008,000) | [3] | 866,000 | [3] | 0 | [3] | 908,000 | [3] | 0 | [3]
Gain Recognized in Income on Derivatives, Ineffective Portion and Amount Excluded from Effectiveness Testing | (295,000) | [4] | 0 | [4] | (42,000) | [4] | 3,000 | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [4] | 0 | [4] | 0 | [4] | 0 | [4] |  | (7,000) | [4] | 0 | [4] | (8,000) | [4] | 3,000 | [4] | (288,000) | [4] | 0 | [4] | (34,000) | [4] | 0 | [4]
Loss activity recognized in other comprehensive loss | (1,400,000) |  | 200,000 |  | (3,100,000) |  | (500,000) |  |  |  |  |  |  | 97,000 | (217,000) | (87,000) | 483,000 |  |  |  |  |  |  |  |  |  |  | (1,450,000) | 0 | (3,041,000) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss activity recognized in other comprehensive loss, tax | 500,000 |  | 100,000 |  | 1,200,000 |  | (200,000) |  |  |  |  |  |  | 38,000 | (84,000) | (33,000) | 186,000 |  |  |  |  |  |  |  |  |  |  | (562,000) | 0 | (1,178,000) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Purchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Amount recognized in accumulated OCI (effective portion) is reported as accumulated other comprehensive income/(loss) of approximately $1.4 million and approximately $0.2 million recorded net of taxes of approximately $0.5 million and $0.1 million as of June 29, 2013 and June 30, 2012, respectively.
[2] | Amount recognized in accumulated OCI (effective portion) is reported as accumulated other comprehensive income/(loss) of approximately $3.1 million and approximately $0.5 million recorded net of taxes of approximately $1.2 million and $0.2 million as of June 29, 2013 and June 30, 2012, respectively.
[3] | Gains and (losses) reclassified from accumulated OCI into income (effective portion) for interest rate swaps is included in interest expense and corn options and natural gas swaps are included in cost of sales, respectively, in the Company’s consolidated statements of operations.
[4] | Gains and (losses) recognized in income on derivatives (ineffective portion) for interest rate swaps, corn options and natural gas swaps is included in other income/(expense), net in the Company’s consolidated statements of operations.

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
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- Definition Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 + Details
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