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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Interest $ 229 $ 321    
Income taxes 21,771 81,662    
Unpaid purchases of property, plant and equipment 663 2,113    
Unsettled common stock proceeds from option exercises 0 237    
Cash and cash equivalents 429,647 331,448 $ 315,302  
Restricted cash 147 1,378    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 429,794 $ 332,826 $ 315,483 $ 308,198