Cash, Cash Equivalents, and Investments - Gross Unrealized Losses and Fair Values for Available-for-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 127,545
Unrealized Losses, Less than 12 Months	(415)
Fair Value, 12 Months or Greater	19,675
Unrealized Losses, 12 Months or Greater	(456)
Total Fair Value	147,220
Total Unrealized Losses	(871)
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	62,910
Unrealized Losses, Less than 12 Months	(272)
Fair Value, 12 Months or Greater	2,455
Unrealized Losses, 12 Months or Greater	(1)
Total Fair Value	65,365
Total Unrealized Losses	(273)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	41,848
Unrealized Losses, Less than 12 Months	(102)
Fair Value, 12 Months or Greater	16,332
Unrealized Losses, 12 Months or Greater	(397)
Total Fair Value	58,180
Total Unrealized Losses	(499)
Sovereign Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	9,300
Unrealized Losses, Less than 12 Months	(25)
Fair Value, 12 Months or Greater	888
Unrealized Losses, 12 Months or Greater	(58)
Total Fair Value	10,188
Total Unrealized Losses	(83)
Treasury Bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	7,614
Unrealized Losses, Less than 12 Months	(5)
Total Fair Value	7,614
Total Unrealized Losses	(5)
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	4,374
Unrealized Losses, Less than 12 Months	(10)
Total Fair Value	4,374
Total Unrealized Losses	(10)
Agency Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	1,499
Unrealized Losses, Less than 12 Months	(1)
Total Fair Value	1,499
Total Unrealized Losses	$ (1)