Investments and Fair Value Measurements-Fixed Income Maturities (Details 7) (Fixed Income Securities [Member], USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 29, 2013
Fixed Income Securities [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost, due in one year or less	$ 1,286,856
Amortized Cost, due in years two through five	3,655,004
Amortized Cost, due in years six through ten	79,657
Amortized Cost, due after year ten	211,853
Amortized Cost	5,233,370	5,128,833
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, due in one year or less	1,290,919
Fair Value, due in years two through five	3,668,402
Fair Value, due in years six through ten	79,670
Fair Value, due after year ten	211,854
Fair Value	$ 5,250,845	$ 5,145,253