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.