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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018	Dec. 30, 2017
Accounting Policies [Abstract]
Interest	$ 13	$ 169
Income taxes	2,157	1,023
Operating lease payments included in the measurement of lease liabilities	1,748	0
ROU assets obtained in exchange for lease liabilities(1)	22,983	0
Unpaid purchases of property, plant and equipment	1,127	1,492
Unsettled common stock proceeds from option exercises	583	794
Cash and cash equivalents	412,900
Restricted cash	149	152
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 413,010	$ 369,650	$ 552,641	$ 315,483

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