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Summary of Fair Value of Interest Rate Swaps (Details) (Interest Rate Swap [Member], Other Noncurrent Liabilities, USD $)
In Thousands, unless otherwise specified
Mar. 30, 2013
Dec. 29, 2012
Interest Rate Swap [Member] | Other Noncurrent Liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value $ (3,369) $ (2,853)