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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018	Dec. 30, 2017
Accounting Policies [Abstract]
Interest	$ 134	$ 184
Income taxes	34,123	29,003
Payments against operating lease liabilities	5,076	0
ROU assets obtained in exchange for lease liabilities(1)	25,965	0
Unpaid purchases of property, plant and equipment	4,170	2,023
Unsettled common stock proceeds from option exercises	0	259
Cash and cash equivalents	633,400
Restricted cash	152	157
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 513,512	$ 493,645	$ 552,641	$ 315,483

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