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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
Jan. 01, 2011
Income tax holiday      
Current foreign income taxes reduced by tax holiday $ 1.2 $ 0.9 $ 0.2
2003 through 2007
     
Income tax holiday      
Tax holiday granted (as a percent) 100.00%    
2008 through 2012
     
Income tax holiday      
Tax holiday granted (as a percent) 60.00%