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Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Swiss Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current year actuarial gain (loss) on plan assets	$ (101)	$ 98	$ (8)
Current year actuarial loss on benefit obligation	(243)	(644)	(269)
Actuarial gain (loss) recorded in current year	103	65	(98)
Prior service credit	(19)	126	(6)
Change in other comprehensive income (loss)	(260)	(355)	(381)
Japan Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Amortization of net transition obligation	7	8	8
Amortization of actuarial gain (loss)	(1)	0	25
Actuarial gain (loss) recorded in current year	(84)	(22)	(37)
Change in other comprehensive income (loss)	$ (78)	$ (14)	$ (4)

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- Definition

Represent other comprehensive income loss actuarial gain loss of current year.

+ References

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- Definition

Reflects the amount of actuarial gain (loss) on benefit obligations of current year.

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Reflects the amount of actuarial gain (loss) on plan assets of current year.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan.

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