Income Taxes - Income Before Income Taxes, Income Tax Provision and Effective Tax Rate (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 30, 2017	Dec. 30, 2017	Dec. 31, 2016	Dec. 31, 2016	Jan. 02, 2016
Income before income taxes
Domestic		$ 9,700		$ 4,313	$ 2,249
Foreign		67,203		60,183	28,014
Income before income taxes		76,903		64,496	30,263
Current:
Domestic		48,947		2,639	951
Foreign		7,077		4,421	3,015
Total Current		56,024		7,060	3,966
Deferred:
Domestic		(25,760)		(2,430)	(5,825)
Foreign		(453)		(1,628)	2,536
Total Deferred		(26,213)		(4,058)	(3,289)
Provision for income taxes		29,811		$ 3,002	$ 677
Transition tax liability	$ 42,600	$ 42,600
Elected TCJA transition tax payment period		8 years
First payment of transition tax	$ 3,400	$ 3,400
Reconciliation of statutory tax rate to effective tax rate
Federal statutory rate (as a percent)	21.00%	35.00%	35.00%	35.00%	35.00%
Foreign tax rate benefit (as a percent)		(25.20%)		(27.20%)	(30.70%)
Research and development tax credits (as a percent)		(4.50%)		(4.10%)	(5.60%)
Release of prior year unrecognized tax benefits (as a percent)		(0.60%)		(1.70%)	(1.90%)
Excess officer compensation (as a percent)		1.50%		1.40%	3.20%
Change in cost-sharing treatment of stock-based compensation		5.20%		(0.50%)	(7.10%)
Excess tax benefit of stock-based compensation		(5.60%)
Change in prior period valuation allowance		(1.30%)		(0.60%)
Transition tax on unremitted foreign earnings		70.80%			8.80%
Revaluation of deferred tax balances		28.20%
Other deferred tax impacts of tax reform		(64.80%)
Other (as a percent)		0.10%		2.40%	0.50%
Effective Tax Rate (as a percent)		38.80%		4.70%	2.20%