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Summary Of Significant Accounting Policies (Amortization Expense Related To Acquired Definite-Lived Intangible Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2020
May 26, 2019
May 27, 2018
Accounting Policies [Abstract]      
Restaurant expense - below-market leases $ 0.0 $ 3.0 $ 3.1
Restaurant expense - above-market leases $ 0.0 $ (1.6) $ (1.7)