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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

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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