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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]
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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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