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Employee Benefit Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 28, 2012
Dec. 30, 2011
Dec. 31, 2010
Swiss Plan [Member]
      
Service cost $ 301 $ 414 $ 328
Interest cost 116 127 120
Net amortization of transition obligation (100) (101) (91)
Actuarial Loss 54 97 55
Net periodic pension cost 371 537 412
Japan Plan [Member]
      
Service cost 185 174 234
Interest cost 13 6 13
Net amortization of transition obligation 16 16 15
Actuarial Loss (58) (117) (24)
Prior Service Cost (1) (1) (1)
Net periodic pension cost $ 155 $ 78 $ 237