Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 24, 2018	Feb. 25, 2017	Feb. 24, 2018	Feb. 25, 2017	Aug. 25, 2018
Income Tax [Line Items]
Effective income tax rate	(34.00%)	39.80%	4.20%	39.20%
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Benefit	$ 22.7		$ 22.7
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense	2.5		2.5
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Benefit	$ (20.2)		$ (20.2)
Scenario, Forecast
Income Tax [Line Items]
Blended statutory income tax rate					25.90%