Cash, Cash Equivalents, and Investments - Gross Unrealized Losses and Fair Values for Available-for-Sale Investments (Detail) $ in Thousands	Oct. 02, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	$ 123,815
Unrealized losses, less than 12 months	(82)
Fair value, 12 months or greater	41,969
Unrealized losses, 12 months or greater	(69)
Total fair value	165,784
Total unrealized losses	(151)
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	44,714
Unrealized losses, less than 12 months	(19)
Fair value, 12 months or greater	0
Unrealized losses, 12 months or greater	0
Total fair value	44,714
Total unrealized losses	(19)
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	55,613
Unrealized losses, less than 12 months	(50)
Fair value, 12 months or greater	24,991
Unrealized losses, 12 months or greater	(58)
Total fair value	80,604
Total unrealized losses	(108)
Asset-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	7,074
Unrealized losses, less than 12 months	(2)
Fair value, 12 months or greater	13,580
Unrealized losses, 12 months or greater	(9)
Total fair value	20,654
Total unrealized losses	(11)
Sovereign Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	16,414
Unrealized losses, less than 12 months	(11)
Fair value, 12 months or greater	3,398
Unrealized losses, 12 months or greater	(2)
Total fair value	19,812
Total unrealized losses	$ (13)