Derivative Instruments And Hedging Activities (Notional Values Of Derivative Contracts Designated And Not Designated As Hedging Instruments) (Details) (USD $) In Millions, unless otherwise specified	Aug. 26, 2012	May 27, 2012
Designated as Hedging Instrument | Natural Gas
Derivative contracts designated as hedging instruments	$ 12.1	$ 8.7
Designated as Hedging Instrument | Foreign Currency
Derivative contracts designated as hedging instruments	14.9	19.4
Designated as Hedging Instrument | Interest Rate Swaps
Derivative contracts designated as hedging instruments	550.0	550.0
Designated as Hedging Instrument | Equity Forwards
Derivative contracts designated as hedging instruments	33.5	21.7
Not Designated as Hedging Instrument | Equity Forwards
Derivative contracts designated as hedging instruments	$ 42.3	$ 50.0