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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 |

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