Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013
Schedule of Available-for-sale Securities [Line Items]
Less than 1 Year	$ 184,708
1-2 Years	152,417
2-3 Years	66,349
3-4 Years	3,588
4-5 Years	1,911
Fair Value	408,973
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 1 Year	104,720
1-2 Years	61,596
2-3 Years	41,299
3-4 Years	2,203
4-5 Years	523
Fair Value	210,341
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 1 Year	41,269
1-2 Years	28,659
Fair Value	69,928
Treasury Bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 1 Year	11,654
1-2 Years	48,015
2-3 Years	9,608
Fair Value	69,277
Sovereign Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 1 Year	8,553
1-2 Years	9,571
2-3 Years	10,911
4-5 Years	888
Fair Value	29,923
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 1 Year	17,013
1-2 Years	4,576
2-3 Years	4,531
3-4 Years	1,385
4-5 Years	500
Fair Value	28,005
Agency Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 1 Year	1,499
Fair Value	$ 1,499