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Pension and Postretirement Benefits (Details 5) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 27, 2012
Pension Benefits [Member]
 
Accumulated other comprehensive income (loss)  
Prior service cost (benefit) $ 3.5
Other Benefits [Member]
 
Accumulated other comprehensive income (loss)  
Prior service cost (benefit) (8.2)
Net actuarial loss $ 7.8