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Income Taxes (Details) - USD ($)
$ in Millions
9 Months Ended
Feb. 23, 2020
Feb. 24, 2019
May 26, 2019
Income Tax Disclosure [Abstract]      
Income tax (benefits) expense $ (7.8) $ 0.6  
Effective tax rate 25.00% 46.00%  
Unrecognized tax benefits $ 0.7   $ 0.6
Unrecognized tax benefits that would result in an adjustment to effective tax rate $ 0.6   $ 0.5