Employee Benefit Plans - Schedule of Defined Benefit Plans Disclosures (Details) - USD ($) $ in Thousands		12 Months Ended
		Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Swiss Plan
Change in Projected Benefit Obligation:
Projected benefit obligation, beginning of period		$ 8,794	$ 7,445
Service cost	[1]	739	474	$ 381
Interest cost	[2]	77	56	53
Participant contributions		458	361
Benefits deposited (paid)		492	189
Actuarial loss (gain)		2,429	269
Prior service credit		(125)	0
Projected benefit obligation, end of period		12,864	8,794	7,445
Change in Plan Assets:
Plan assets at fair value, beginning of period		5,130	4,144
Actual return on plan assets		152	3
Employer contributions		542	433
Participant contributions		458	361
Benefits deposited (paid)		492	189
Plan assets at fair value, end of period		6,774	5,130	4,144
Funded status (pension liability), end of year	[3]	(6,090)	(3,664)
Amount Recognized in Accumulated Other Comprehensive Income (Loss), net of tax:
Actuarial loss on plan assets		(1,031)	(1,035)
Actuarial loss on benefit obligation		(4,317)	(2,145)
Actuarial gain (loss) recognized in current year		744	630
Prior service credit		258	165
Effect of curtailments		609	609
Accumulated other comprehensive income (loss)		(3,737)	(1,776)
Accumulated benefit obligation at year end		(12,043)	(8,230)
Japan Plan
Change in Projected Benefit Obligation:
Projected benefit obligation, beginning of period		1,646	1,352
Service cost	[1]	185	153	147
Interest cost	[4]	7	4	4
Benefits deposited (paid)		(66)	(9)
Actuarial loss (gain)		(58)	119
Foreign exchange adjustment		36	27
Projected benefit obligation, end of period		1,750	1,646	1,352
Change in Plan Assets:
Plan assets at fair value, beginning of period		0	0
Actual return on plan assets		0	0
Employer contributions		0	0
Plan assets at fair value, end of period		0	0	$ 0
Benefits paid		0	0
Distribution of plan assets		0	0
Foreign exchange adjustment		0	0
Funded status (pension liability), end of year	[3]	(1,750)	(1,646)
Amount Recognized in Accumulated Other Comprehensive Income (Loss), net of tax:
Transition obligation		0	0
Actuarial gain (loss) recognized in current year		(37)	(36)
Prior service credit		7	8
Net gain		68	38
Accumulated other comprehensive income (loss)		38	10
Accumulated benefit obligation at year end		$ (1,599)	$ (1,416)

[1] Recognized in selling general and administrative expenses on the Consolidated Statements of Operations.

[2] For years ended 2019 and 2018, recognized in other income (expense), net, and for the year ended 2017, recognized in selling, general and administrative expenses on the Consolidated Statements of Operations.

[3] The underfunded balance was included in pension liability on the Consolidated Balance Sheets.

[4] For the years ended 2019 and 2018, recognized in other income (expense), net, and for the year ended 2017, recognized in selling, general and administrative expenses on the Consolidated Statements of Operations.