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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Interest	$ 184	$ 432
Income taxes	29,003	86,759
Unpaid purchases of property, plant and equipment	2,023	3,349
Unsettled common stock proceeds from option exercises	259	113
Unsettled stock repurchases	0	2,653
Cash and cash equivalents	493,488	289,944	$ 315,302
Restricted cash	157	582
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 493,645	$ 290,526	$ 315,483	$ 308,198

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