Investments and Fair Value Measurements (Details 8) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Jan. 01, 2012
Related costs and the fair values based on quoted market prices
Convertible long-term debt, carrying value	$ 1,627,234	$ 1,604,911
Convertible Debt [Member]
Related costs and the fair values based on quoted market prices
Convertible long-term debt, carrying value	1,627,234	1,604,911
Fair Value	2,105,883	2,091,640
1% Sr. Convertible Notes due 2013 [Member]
Related costs and the fair values based on quoted market prices
Convertible long-term debt, carrying value	865,412	852,146
Fair Value	922,493	914,140
1.5% Sr. Convertible Notes due 2017 [Member]
Related costs and the fair values based on quoted market prices
Convertible long-term debt, carrying value	761,822	752,765
Fair Value	$ 1,183,390	$ 1,177,500