Income Taxes - Textual (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Operating Loss Carryforwards [Line Items]
Change in amount of operating loss carryforwards valuation allowance	$ (2,700)	$ 1,500
Maximum amount company recognize from unrecognized tax benefit	8,108	$ 7,151	$ 6,477	$ 6,961
Unrecognized tax benefits that would impact effective tax rate if recognized	4,600
California [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	23,500
State research and experimental tax credit carryforward	10,200
Change In valuation allowance for deferred tax assets	500
Other States [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,700
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	18,300
Federal [Member]
Operating Loss Carryforwards [Line Items]
State research and experimental tax credit carryforward	5,400
Germany[Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Change In valuation allowance for deferred tax assets	(4,800)
Switzerland [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Change In valuation allowance for deferred tax assets	$ 1,600