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Notes Payable, Long-Term Debt, Commitments and Contingencies (Details) (USD $)
9 Months Ended 0 Months Ended 0 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Uncommitted bank lines
Aug. 29, 2014
Credit Agreement
Jun. 28, 2014
Credit Agreement
Aug. 29, 2014
Credit Agreement
Interest expense
Oct. 24, 2014
Subsequent event
Credit Agreement
Foreign subsidiaries
Commodity Trading and Milling segment
Debt Instrument              
Maximum capacity             $ 50,000,000
Amount reclassified from long-term debt to current maturities of long-term debt         74,100,000    
Principal payments of long-term debt 91,403,000 29,909,000   85,500,000      
Fee for early payment           3,760,000  
Letters of credit outstanding     $ 1,386,000