Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	May 26, 2018	May 27, 2017	May 26, 2018	May 27, 2017	Aug. 25, 2018
Income Tax [Line Items]
Effective income tax rate	23.90%	38.10%	10.70%	38.90%
Estimated net benefit for transition tax			$ 22.7
Estimated charge for transition tax			2.5
Tax benefit related to vesting of restricted stock units	$ 0.4		2.6
Provisional net benefit			$ (20.2)
Scenario, Forecast
Income Tax [Line Items]
Blended statutory income tax rate					25.90%