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Summary of Significant Accounting Policies - Fair Value Assets Measured on a Nonrecurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2014
Dec. 28, 2013
Sep. 30, 2008
Nekton Research LLC [Member]
Research Reporting Unit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill $ 48,751 $ 48,751 $ 200
Finite-Lived Intangible Assets, Gross 31,500 31,500  
Finite-Lived Intangible Assets, Net $ 21,764 $ 22,668