Geographical Information - Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Dec. 25, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Sales	$ 924,351	$ 562,759	$ 469,103
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales	512,153	308,129	313,090
China [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales	36,893	13,152	21,464
Singapore [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales	287,887	175,843	103,176
Austria [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales	34,546	35,729	12,568
Others [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales	$ 52,872	$ 29,906	$ 18,805