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Derivative Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 30, 2012 | Apr. 01, 2012
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Summary of fair values and classification in the consolidated balance sheets of derivative instruments |  |  |
Total | $ 335 | $ 1,062 | $ 0
Commodity hedges [Member] | Fair market value [Member] | Prepaid expenses and other current assets [Member] |  |  |
Summary of fair values and classification in the consolidated balance sheets of derivative instruments |  |  |
Total | 10 | 500 | 0
Commodity hedges [Member] | Unamortized cost [Member] | Prepaid expenses and other current assets [Member] |  |  |
Summary of fair values and classification in the consolidated balance sheets of derivative instruments |  |  |
Total | $ 325 | $ 562 | $ 0

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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