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Pension And Postretirement Benefits (Details 5) (USD $)
In Millions
12 Months Ended
May 29, 2011
Pension Benefits [Member]
 
Accumulated other comprehensive income (loss)  
Prior service cost (benefit) $ 3.1
Net actuarial loss 38.2
Other Benefits [Member]
 
Accumulated other comprehensive income (loss)  
Prior service cost (benefit) (8.7)
Net actuarial loss $ 6.0