Investments and Fair Value Measurements-Fixed Income Maturities (Details 7) (Fixed Income Securities [Member], USD $) In Thousands, unless otherwise specified	Dec. 29, 2013	Dec. 30, 2012
Fixed Income Securities [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost, due in one year or less	$ 1,220,506
Amortized Cost, due in years two through five	3,338,613
Amortized Cost, due in years six through ten	79,295
Amortized Cost, due after year ten	490,419
Amortized Cost	5,128,833	4,920,082
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, due in one year or less	1,224,980
Fair Value, due in years two through five	3,350,852
Fair Value, due in years six through ten	79,084
Fair Value, due after year ten	490,337
Fair Value	$ 5,145,253	$ 4,945,325