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Employee Benefit Plans - Schedule of Changes in Fair Value of Plan Assets (Details) - Swiss Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Plan assets at fair value, beginning of period $ 4,144 $ 3,606
Actual return on plan assets 3 203
Plan assets at fair value, end of period 5,130 4,144
Insurance Contracts | Fair Value, Inputs, Level 3    
Plan assets at fair value, beginning of period 4,144 3,606
Actual return on plan assets 3 203
Purchases, sales, and settlement 983 335
Plan assets at fair value, end of period $ 5,130 $ 4,144