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Employee Benefit Plans (Details)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 28, 2012
USD ($)
Dec. 30, 2011
USD ($)
Dec. 31, 2010
USD ($)
Sep. 30, 2009
USD ($)
Sep. 30, 2009
JPY (¥)
Dec. 28, 2012
Swiss Plan [Member]
USD ($)
Dec. 30, 2011
Swiss Plan [Member]
USD ($)
Dec. 31, 2010
Swiss Plan [Member]
USD ($)
Dec. 28, 2012
Japan Plan [Member]
USD ($)
Dec. 30, 2011
Japan Plan [Member]
USD ($)
Dec. 31, 2010
Japan Plan [Member]
USD ($)
Change in Projected Benefit Obligation:                      
Projected benefit obligation, beginning of period           $ 4,710 $ 4,868   $ 1,108 $ 782  
Service cost           301 414 328 185 174 234
Interest cost           116 127 120 13 6 13
Participant contributions           234 275        
Benefits paid           (639) (641)   (65) (38)  
Actuarial (gain) loss on obligation           131 (333)   63 137  
Foreign exchange adjustment                 (116) 47  
Projected benefit obligation, end of period           4,853 4,710 4,868 1,188 1,108 782
Changes in Plan Assets:                      
Plan assets at fair value, beginning of period       643 58,000 3,058 3,074   0 0  
Actual return on plan assets (including foreign currency impact)           166 75   0 0  
Employer contributions 284 150 123     234 275   0 0  
Participant contributions           234 275        
Benefits paid           (639) (641)   0 0  
Foreign exchange adjustment                 0 0  
Plan assets at fair value, end of period       643 58,000 3,053 3,058 3,074 0 0 0
Net Amount Recognized in Consolidated Balance Sheets:                      
Underfunded, end of year           (1,800) (1,652)   (1,188) (1,108)  
Other long term liabilities           (1,800) (1,652)   (1,188) (1,108)  
Amount Recognized in Accumulated Other Comprehensive Loss, Net of Tax:                      
Actuarial loss on plan assets           (558) (610)   117 101  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)                 28 29  
Actuarial loss on benefit obligation           (466) (364)        
Actuarial gain recognized in current year           205 163   99 207  
Accumulated other comprehensive loss           (819) (811)   306 337  
Accumulated benefit obligation at end of year           $ (4,410) $ (4,087)   $ (972) $ (912)