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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Provision for Income Taxes at Statutory Rate (21% in 2019 and 2018 and 35% in 2017)	$ 14,474	$ 16,701	$ 20,179
Increases (Decreases) Resulting From:
State income taxes, net of federal tax	(355)	164	151
U.S. tax cost of foreign earnings	146	1,215	761
Foreign tax rate differential	2,584	3,158	(3,747)
(Reversal of) provision for tax benefit reserves, net	(286)	(1,785)	1,517
Change in valuation allowance	81	141	(341)
Nondeductible expenses	2,454	781	1,177
Research and development tax credits	(381)	(445)	(297)
Excess tax benefit related to stock-based compensation	(3,352)	(967)	(581)
Impact of the U.S. Tax Cuts and Jobs Act	0	(106)	7,093
Other	993	(375)	158
Total income tax provision	$ 16,358	$ 18,482	$ 26,070

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