Cash, Cash Equivalents, and Investments - Gross Unrealized Losses and Fair Values for Available-for-Sale Investments (Detail) $ in Thousands	Oct. 04, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	$ 167,233
Unrealized losses, less than 12 months	(926)
Fair value, 12 months or greater	9,269
Unrealized losses, 12 months or greater	(100)
Total fair value	176,502
Total unrealized losses	(1,026)
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	118,452
Unrealized losses, less than 12 months	(879)
Fair value, 12 months or greater	6,935
Unrealized losses, 12 months or greater	(96)
Total fair value	125,387
Total unrealized losses	(975)
Asset-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	48,781
Unrealized losses, less than 12 months	(47)
Fair value, 12 months or greater	2,334
Unrealized losses, 12 months or greater	(4)
Total fair value	51,115
Total unrealized losses	$ (51)