Income Taxes Narrative (Details) - USD ($) $ in Billions	3 Months Ended	12 Months Ended
	Mar. 24, 2018	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Federal Statutory Tax Rate, Pre TCJ Act		35.00%
Federal Statutory Tax Rate, Post TCJ Act	21.00%
Provisional net tax expense related to the TCJ Act		$ 2.5
Additional Transition Tax [Table Text Block]	$700-$800 million