Investments and Fair Value Measurements-Debt Instrument FV (Details 8) - USD ($) $ in Thousands	Apr. 03, 2016	Jan. 03, 2016
Related costs and the fair values based on quoted market prices
Convertible debt, carrying value	$ 2,175,578	$ 2,150,954
Convertible Debt [Member]
Related costs and the fair values based on quoted market prices
Convertible debt, carrying value	2,175,578	2,150,954
Convertible debt, fair value	3,138,229	3,137,035
1.5% Sr. Convertible Notes due 2017 [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Related costs and the fair values based on quoted market prices
Convertible debt, carrying value	925,486	913,178
Convertible debt, fair value	1,577,929	1,573,285
0.5% Sr. Convertible Notes due 2020 [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Related costs and the fair values based on quoted market prices
Convertible debt, carrying value	1,250,092	1,237,776
Convertible debt, fair value	$ 1,560,300	$ 1,563,750