Fair Value Measurements and Other-Than-Temporary Impairments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Assets
Total Assets	$ 281,092	$ 117,923
Money Market Funds [Member]
Assets
Total Assets	72,386	25,560
Certificates of Deposit [Member]
Assets
Total Assets	2,640	2,160
Commercial Paper [Member]
Assets
Total Assets	88,720	14,843
Corporate Bonds [Member]
Assets
Total Assets	109,540	57,467
U.S. Treasuries [Member]
Assets
Total Assets	7,806	15,020
ARS [Member]
Assets
Total Assets	0	2,873
Foreign Currency Exchange Forward Contracts [Member]
Liabilities
Total Liabilities	64	112
Level 1 [Member]
Assets
Total Assets	80,192	40,580
Level 1 [Member] | Money Market Funds [Member]
Assets
Total Assets	72,386	25,560
Level 1 [Member] | Certificates of Deposit [Member]
Assets
Total Assets	0	0
Level 1 [Member] | Commercial Paper [Member]
Assets
Total Assets	0	0
Level 1 [Member] | Corporate Bonds [Member]
Assets
Total Assets	0	0
Level 1 [Member] | U.S. Treasuries [Member]
Assets
Total Assets	7,806	15,020
Level 1 [Member] | ARS [Member]
Assets
Total Assets	0	0
Level 1 [Member] | Foreign Currency Exchange Forward Contracts [Member]
Liabilities
Total Liabilities	0	0
Level 2 [Member]
Assets
Total Assets	200,900	74,470
Level 2 [Member] | Money Market Funds [Member]
Assets
Total Assets	0	0
Level 2 [Member] | Certificates of Deposit [Member]
Assets
Total Assets	2,640	2,160
Level 2 [Member] | Commercial Paper [Member]
Assets
Total Assets	88,720	14,843
Level 2 [Member] | Corporate Bonds [Member]
Assets
Total Assets	109,540	57,467
Level 2 [Member] | U.S. Treasuries [Member]
Assets
Total Assets	0	0
Level 2 [Member] | ARS [Member]
Assets
Total Assets	0	0
Level 2 [Member] | Foreign Currency Exchange Forward Contracts [Member]
Liabilities
Total Liabilities	64	112
Level 3 [Member]
Assets
Total Assets	0	2,873
Level 3 [Member] | Money Market Funds [Member]
Assets
Total Assets	0	0
Level 3 [Member] | Certificates of Deposit [Member]
Assets
Total Assets	0	0
Level 3 [Member] | Commercial Paper [Member]
Assets
Total Assets	0	0
Level 3 [Member] | Corporate Bonds [Member]
Assets
Total Assets	0	0
Level 3 [Member] | U.S. Treasuries [Member]
Assets
Total Assets	0	0
Level 3 [Member] | ARS [Member]
Assets
Total Assets	0	2,873
Level 3 [Member] | Foreign Currency Exchange Forward Contracts [Member]
Liabilities
Total Liabilities	$ 0	$ 0