Investments and Fair Value Measurements-Debt Instrument FV (Details 8) - USD ($) $ in Thousands	Sep. 27, 2015	Dec. 28, 2014
Related costs and the fair values based on quoted market prices
Convertible debt, carrying value	$ 2,137,737	$ 2,069,341
Convertible Debt [Member]
Related costs and the fair values based on quoted market prices
Convertible debt, carrying value	2,137,737	2,069,341
Convertible debt, fair value	2,586,304	3,738,221
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	903,515	869,645
Convertible debt, fair value	1,197,304	1,948,721
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	1,234,222
Convertible debt, fair value	$ 1,389,000
0.5% Sr. Convertible Notes due 2020 [Member] | Significant Other Observable Inputs (Level 2) [Member]
Related costs and the fair values based on quoted market prices
Convertible debt, carrying value		1,199,696
Convertible debt, fair value		$ 1,789,500