Financial Statement Components - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 24, 2016	Sep. 26, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			$ (5,202)
Current period change	$ 520	$ (218)	2,091	$ (1,938)
End of period	(3,111)		(3,111)
Foreign Currency Translations [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			(4,948)
Current period change			2,018
End of period	(2,930)		(2,930)
Defined Benefit Pension Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			(210)
End of period	(210)		(210)
Unrealized Income (Loss) on Investment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			(44)
Current period change			73
End of period	$ 29		$ 29