Summary Of Significant Accounting Policies (Costs And Accumulated Amortization Of Acquired Definite-Lived Intangible Assets) (Details) - USD ($) $ in Millions	May 26, 2019	May 27, 2018
Accounting Policies [Abstract]
Definite-lived intangible assets	$ 80.3	$ 83.0
Accumulated amortization	(30.4)	(25.7)
Definite-lived intangible assets, net of accumulated amortization	49.9	57.3
Definite-lived intangible liabilities	(33.5)	(33.5)
Accumulated amortization	13.6	11.3
Definite-lived intangible liabilities, net of accumulated amortization	$ (19.9)	$ (22.2)