Stock-Based Compensation Expense - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		6 Months Ended
		Jul. 05, 2015	Jul. 05, 2015
Shares (in thousands)
Outstanding, shares		6,812
Granted, shares		1,427
Exercised, shares		(1,280)
Forfeited or expired, shares		(43)
Outstanding, shares		6,916
Exercisable as of July 5, 2015, shares			2,533
Options vested or expected to vest as of July 5, 2015, shares	[1]		6,140
Weighted- Average Exercise Price
Outstanding, in dollars per share		$ 23.26
Granted, in dollars per share		41.36
Exercised, in dollars per share		16.76
Forfeited or expired, in dollars per share		8.68
Outstanding, in dollars per share		28.14
Outstanding		$ 23.26	$ 28.14
Exercisable as of July 5, 2015, Weighted-Average Exercise Price, in dollars per share			16.74
Weighted- Average Remaining Contractual Term (in years)	[1]		$ 26.97
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, in years		7 years 5 months 1 day
Exercisable, in years		5 years 7 months 02 days
Options vested or expected to vest, in years	[1]	7 years 2 months
Aggregate Intrinsic Value (in thousands)
Outstanding, in dollars			$ 136,975
Exercisable, in dollars			79,074
Options vested or expected to vest, in dollars	[1]		$ 128,812

[1] In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.