Investments and Fair Value Measurements-Fixed Income Maturities (Details 7) (Fixed Income Securities [Member], USD $) In Thousands, unless otherwise specified	Jun. 29, 2014	Dec. 29, 2013
Fixed Income Securities [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost, due in one year or less	$ 1,044,738
Amortized Cost, due in years two through five	3,376,891
Amortized Cost, due in years six through ten	169,014
Amortized Cost, due after year ten	776,701
Amortized Cost	5,367,344	5,128,833
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, due in one year or less	1,047,537
Fair Value, due in years two through five	3,393,204
Fair Value, due in years six through ten	169,190
Fair Value, due after year ten	778,226
Fair Value	$ 5,388,157	$ 5,145,253