Stock-Based Compensation Expense - Summary of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 29, 2019 USD ($) $ / shares shares
Shares (in thousands)
Outstanding, shares | shares	13,789
Granted, shares | shares	2,879
Exercised, shares | shares	(1,475)
Forfeited or expired, shares | shares	(726)
Outstanding, shares | shares	14,467
Exercisable as of reporting date, shares | shares	5,714
Options vested or expected to vest as of reporting date, shares | shares	13,116
Weighted- Average Exercise Price
Outstanding, shares | $ / shares	$ 31.73
Granted, in dollars per share | $ / shares	51.22
Exercised, in dollars per share | $ / shares	21.53
Forfeited or expired, in dollars per share | $ / shares	41.79
Outstanding, shares | $ / shares	36.14
Exercisable as of reporting date, Weighted-Average Exercise Price, in dollars per share | $ / shares	25.33
Weighted- Average Remaining Contractual Term (in years) | $ / shares	$ 34.90
Weighted- Average Remaining Contractual Term (in years)
Outstanding, in years	7 years 2 months 8 days
Exercisable, in years	5 years 8 months 23 days
Options vested or expected to vest, in years	7 years 14 days
Aggregate Intrinsic Value (in thousands)
Outstanding, in dollars | $	$ 203,774
Exercisable, in dollars | $	134,913
Options vested or expected to vest, in dollars | $	$ 199,066