Financial Statement Components - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance Value	$ 243,774	$ 187,328	$ 179,537
Current period change	3,922	(844)	(2,433)
Ending Balance Value	262,383	243,774	187,328
Foreign Currency Translations [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance Value	(5,817)	(4,948)
Current period change	4,170	(869)
Ending Balance Value	(1,647)	(5,817)	(4,948)
Defined Benefit Pension Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance Value	(227)	(210)
Current period change	(160)	(17)
Ending Balance Value	(387)	(227)	(210)
Unrealized Income (Loss) on Investment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance Value	(2)	(44)
Current period change	(88)	42
Ending Balance Value	(90)	(2)	(44)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance Value	(6,046)	(5,202)	(2,769)
Ending Balance Value	$ (2,124)	$ (6,046)	$ (5,202)