Basis of Presentation (Details) $ in Millions	Jan. 06, 2021	Nov. 29, 2020 USD ($) restaurant	Jun. 01, 2020 USD ($)	May 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Retained earnings | $		$ (223.2)		$ (143.5)
Subsequent Event
Summary Of Significant Accounting Policies [Line Items]
Restaurants with dining rooms open (in percent)	84.00%
Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Retained earnings | $			$ 7.5
Retained earnings, net of tax | $			$ 2.5
Entity Operated Units
Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant		3
Franchised Units
Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant		32
Franchised Units | Latin America
Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant		27