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Discontinued Operations and Other Disposals (Details) (USD $)
In Millions
3 Months Ended 12 Months Ended 3 Months Ended
Apr. 28, 2010
Apr. 28, 2010
Apr. 29, 2009
Apr. 27, 2011
Jan. 27, 2010
Appetizers And, Inc. [Member]
Jan. 27, 2010
Private label frozen desserts business in the U.K. [Member]
Oct. 28, 2009
Kabobs [Member]
Summary of Operating Results for Discontinued Operations              
Sales   $ 63.0 $ 136.8        
Net after-tax losses   (4.7) (6.4)        
Tax benefit on losses   2.0 2.4        
Discontinued Operations and Other Disposals (Textuals) [Abstract]              
Pre tax losses on sale of business         (14.5) (31.4) (15.0)
After tax losses on sale of business         (10.4) (23.6) (10.9)
Discontinued Operation And Other Disposals [Textuals] [Abstract]              
Cash proceeds from government for acquisition of property 94.6 94.6          
Leaseback period for factory, in years 3 years            
Proceeds deferred based on Management's total estimated future costs 81.2 81.2   63.2      
Excess of proceeds received over estimated costs to be recovered and incurred   $ 15.0