Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Current:
Federal	$ 3,250	$ 697	$ 148
State	9	85	3
Foreign	2,998	2,111	2,266
Total current	6,257	2,893	2,417
Deferred:
Federal	6,314	(16,641)	190
State	53	(320)	3
Foreign	472	(832)	53
Total deferred	6,839	(17,793)	246
Provision (benefit) for income taxes	$ 13,096	$ (14,900)	$ 2,663