Investments and Fair Value Measurements-AFS FV and Unrealized Losses (Details 5) (USD $)	6 Months Ended
	Jun. 29, 2014
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	$ 694,458,000
Less than 12 months, Gross Unrealized Loss	(912,000)
Greater than 12 months, Fair Value	264,000
Greater than 12 months, Gross Unrealized Loss	(4,000)
U.S. Treasury securities [Member]
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	98,301,000
Less than 12 months, Gross Unrealized Loss	(64,000)
Greater than 12 months, Fair Value	0
Greater than 12 months, Gross Unrealized Loss	0
U.S. Government-sponsored agency securities [Member]
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	10,715,000
Less than 12 months, Gross Unrealized Loss	(12,000)
Greater than 12 months, Fair Value	0
Greater than 12 months, Gross Unrealized Loss	0
International Government Securities [Member]
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	32,175,000
Less than 12 months, Gross Unrealized Loss	(56,000)
Greater than 12 months, Fair Value	0
Greater than 12 months, Gross Unrealized Loss	0
Corporate notes and bonds [Member]
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	262,842,000
Less than 12 months, Gross Unrealized Loss	(316,000)
Greater than 12 months, Fair Value	0
Greater than 12 months, Gross Unrealized Loss	0
Asset-backed securities [Member]
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	39,162,000
Less than 12 months, Gross Unrealized Loss	(41,000)
Greater than 12 months, Fair Value	0
Greater than 12 months, Gross Unrealized Loss	0
Mortgage-backed Securities [Member]
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	38,774,000
Less than 12 months, Gross Unrealized Loss	(156,000)
Greater than 12 months, Fair Value	264,000
Greater than 12 months, Gross Unrealized Loss	(4,000)
Municipal notes and bonds [Member]
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	212,489,000
Less than 12 months, Gross Unrealized Loss	(267,000)
Greater than 12 months, Fair Value	0
Greater than 12 months, Gross Unrealized Loss	$ 0