Income Taxes (Narrative) (Details) - USD ($) $ in Millions	May 28, 2017	May 29, 2016
Income Tax Disclosure [Line Items]
Prepaid income taxes	$ 6.2	$ 46.1
Gross unrecognized tax benefits	16.4	$ 14.3
Tax position, change is reasonably possible in the next twelve month	0.7
Unrecognized tax benefits, accrued interest	0.9
State
Income Tax Disclosure [Line Items]
Prepaid income taxes	6.2
Federal
Income Tax Disclosure [Line Items]
Taxes payable	$ (1.9)