Investments and Fair Value Measurements-AFS FV and Unrealized Losses (Details 5)	12 Months Ended
	Jan. 03, 2016 USD ($)
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	$ 1,194,985,000
Less than 12 months, Gross Unrealized Loss	(725,000)
Greater than 12 months, Fair Value	28,173,000
Greater than 12 months, Gross Unrealized Loss	(24,000)
U.S. Treasury securities [Member]
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	75,635,000
Less than 12 months, Gross Unrealized Loss	(3,000)
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	11,914,000
Less than 12 months, Gross Unrealized Loss	(74,000)
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	47,447,000
Less than 12 months, Gross Unrealized Loss	(16,000)
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	399,680,000
Less than 12 months, Gross Unrealized Loss	(546,000)
Greater than 12 months, Fair Value	10,938,000
Greater than 12 months, Gross Unrealized Loss	(13,000)
Asset-backed securities [Member]
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	114,932,000
Less than 12 months, Gross Unrealized Loss	(68,000)
Greater than 12 months, Fair Value	4,726,000
Greater than 12 months, Gross Unrealized Loss	(7,000)
Mortgage-backed Securities [Member]
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	10,726,000
Less than 12 months, Gross Unrealized Loss	(1,000)
Greater than 12 months, Fair Value	1,930,000
Greater than 12 months, Gross Unrealized Loss	(3,000)
Municipal notes and bonds [Member]
Available-for-sale securities that were in an unrealized gain position
Less than 12 months, Fair Value	534,651,000
Less than 12 months, Gross Unrealized Loss	(17,000)
Greater than 12 months, Fair Value	10,579,000
Greater than 12 months, Gross Unrealized Loss	$ (1,000)