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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Aug. 25, 2018 | Aug. 25, 2018 | Aug. 26, 2017 | Aug. 27, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |
U.S. federal statutory rate | 35.00% | 21.00% | 25.90% | [1] | 35.00% | 35.00%
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit) |  |  | $ 3.6 |  |  |
[1] | The U.S. federal statutory rate for the year ended August 25, 2018 is a blended rate, which includes the impact of the Tax Act enactment.

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