Stock-Based Compensation Expense - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 03, 2016
Shares (in thousands)
Outstanding, shares	6,644
Granted, shares	1,662
Exercised, shares	(196)
Forfeited or expired, shares	(43)
Outstanding, shares	8,067
Exercisable as of October 4, 2015, shares		3,645
Options vested or expected to vest as of October 4, 2015, shares		7,248
Weighted- Average Exercise Price
Outstanding, in dollars per share	$ 28.27
Granted, in dollars per share	33.45
Exercised, in dollars per share	17.53
Forfeited or expired, in dollars per share	37.56
Outstanding, in dollars per share	29.55
Outstanding	$ 28.27	$ 29.55
Exercisable as of October 4, 2015, Weighted-Average Exercise Price, in dollars per share		21.69
Weighted- Average Remaining Contractual Term (in years)		$ 28.75
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, in years	7 years 6 months 4 days
Exercisable, in years	5 years 9 months 29 days
Options vested or expected to vest, in years	7 years 3 months 29 days
Aggregate Intrinsic Value (in thousands)
Outstanding, in dollars		$ 81,838
Exercisable, in dollars		64,616
Options vested or expected to vest, in dollars		$ 79,128