Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014
Schedule of Available-for-sale Securities [Line Items]
1 Year or Less	$ 49,758
1-2 Years	185,541
2-3 Years	142,986
3-4 Years	43,289
4-5 Years	30,988
5-8 Years	4,523
Fair Value	457,085
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
1 Year or Less	45,889
1-2 Years	68,817
2-3 Years	102,268
3-4 Years	18,128
4-5 Years	20,166
5-8 Years	0
Fair Value	255,268
Treasury Bills
Schedule of Available-for-sale Securities [Line Items]
1 Year or Less	0
1-2 Years	90,210
2-3 Years	12,464
3-4 Years	0
4-5 Years	0
5-8 Years	0
Fair Value	102,674
Asset-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
1 Year or Less	189
1-2 Years	9,677
2-3 Years	15,262
3-4 Years	24,657
4-5 Years	10,822
5-8 Years	4,523
Fair Value	65,130
Sovereign Bonds
Schedule of Available-for-sale Securities [Line Items]
1 Year or Less	1,709
1-2 Years	12,372
2-3 Years	5,153
3-4 Years	0
4-5 Years	0
5-8 Years	0
Fair Value	19,234
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
1 Year or Less	1,971
1-2 Years	2,965
2-3 Years	3,574
3-4 Years	504
4-5 Years	0
5-8 Years	0
Fair Value	9,014
Agency Bonds
Schedule of Available-for-sale Securities [Line Items]
1 Year or Less	0
1-2 Years	1,500
2-3 Years	4,265
3-4 Years	0
4-5 Years	0
5-8 Years	0
Fair Value	$ 5,765