Investments Investments Equity Securities (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI	$ 2,698,720	$ 2,547,180
Equity Securities [Member]
Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI	2,698,720	2,383,095
Equity Securities, Restricted [Member]
Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Restricted	$ 0	$ 164,085