Stock-Based Compensation Expense - Summary of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2018 USD ($) $ / shares shares
Shares (in thousands)
Outstanding, shares | shares	12,726
Granted, shares | shares	2,043
Exercised, shares | shares	(697)
Forfeited or expired, shares | shares	(68)
Outstanding, shares | shares	14,004
Exercisable as of reporting date, shares | shares	4,879
Options vested or expected to vest as of reporting date, shares | shares	12,377
Weighted- Average Exercise Price
Outstanding, in dollars per share | $ / shares	$ 25.24
Granted, in dollars per share | $ / shares	56.44
Exercised, in dollars per share | $ / shares	15.96
Forfeited or expired, in dollars per share | $ / shares	25.84
Outstanding, in dollars per share | $ / shares	30.25
Exercisable as of reporting date, Weighted-Average Exercise Price, in dollars per share | $ / shares	19.88
Options vested or expected to vest as of period end (in dollars per share) | $ / shares	$ 28.99
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, in years	7 years 10 months 24 days
Exercisable, in years	6 years 6 months
Options vested or expected to vest, in years	7 years 9 months 18 days
Aggregate Intrinsic Value (in thousands)
Outstanding, in dollars | $	$ 317,169
Exercisable, in dollars | $	156,676
Options vested or expected to vest, in dollars | $	$ 294,379