Cash, Cash Equivalents, and Investments - Gross Unrealized Losses and Fair Values for Available-for-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 05, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 98,187
Unrealized Losses, Less than 12 Months	(125)
Fair Value, 12 Months or Greater	2,996
Unrealized Losses, 12 Months or Greater	(6)
Total Fair Value	101,183
Total Unrealized Losses	(131)
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	33,143
Unrealized Losses, Less than 12 Months	(9)
Fair Value, 12 Months or Greater	0
Unrealized Losses, 12 Months or Greater	0
Total Fair Value	33,143
Total Unrealized Losses	(9)
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	48,070
Unrealized Losses, Less than 12 Months	(109)
Fair Value, 12 Months or Greater	399
Unrealized Losses, 12 Months or Greater	(1)
Total Fair Value	48,469
Total Unrealized Losses	(110)
Asset-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	16,974
Unrealized Losses, Less than 12 Months	(7)
Fair Value, 12 Months or Greater	2,597
Unrealized Losses, 12 Months or Greater	(5)
Total Fair Value	19,571
Total Unrealized Losses	$ (12)