Stock-Based Compensation Expense - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jul. 02, 2017	Jul. 02, 2017
Shares (in thousands)
Outstanding, shares	6,433
Granted, shares	1,937
Exercised, shares	(1,365)
Forfeited or expired, shares	(64)
Outstanding, shares	6,941
Exercisable as of reporting date, shares		2,015
Options vested or expected to vest as of reporting date, shares		6,033
Weighted- Average Exercise Price
Outstanding, shares	$ 32.16
Granted, in dollars per share	77.36
Exercised, in dollars per share	25.68
Forfeited or expired, in dollars per share	43.11
Outstanding, shares	45.95
Outstanding	$ 32.16	$ 45.95
Exercisable as of reporting date, Weighted-Average Exercise Price, in dollars per share		27.39
Weighted- Average Remaining Contractual Term (in years)		$ 44.28
Weighted- Average Remaining Contractual Term (in years)
Outstanding, in years	7 years 10 months 28 days
Exercisable, in years	5 years 10 months 6 days
Options vested or expected to vest, in years	7 years 8 months 27 days
Aggregate Intrinsic Value (in thousands)
Outstanding, in dollars		$ 270,790
Exercisable, in dollars		115,900
Options vested or expected to vest, in dollars		$ 245,371