Financial Statement Components - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			$ (6,046)
Current period change	$ 753	$ 584	2,689	$ 1,571
End of period	(3,357)		(3,357)
Foreign Currency Translations [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			(5,817)
Current period change			2,706
End of period	(3,111)		(3,111)
Defined Benefit Pension Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			(227)
End of period	(227)		(227)
Unrealized Income (Loss) on Investment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period			(2)
Current period change			(17)
End of period	$ (19)		$ (19)