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Taxes (Details 4) (Swiss tax rate, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Dec. 28, 2013
2008 through 2012
Income tax holiday      
Tax holiday granted (as a percent)     60.00%
Current foreign income taxes reduced by tax holiday $ 1.2 $ 0.9