Summary Of Significant Accounting Policies (Costs And Accumulated Amortization Of Acquired Definite-Lived Intangible Assets) (Details) - USD ($) $ in Millions	May 31, 2020	May 26, 2019
Accounting Policies [Abstract]
Definite-lived intangible assets	$ 23.8	$ 80.3
Accumulated amortization	(6.4)	(30.4)
Definite-lived intangible assets, net of accumulated amortization	17.4	49.9
Definite-lived intangible liabilities	(3.0)	(33.5)
Accumulated amortization	0.9	13.6
Definite-lived intangible liabilities, net of accumulated amortization	$ (2.1)	$ (19.9)