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Redeemable and Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Aug. 26, 2012
Aug. 28, 2011
May 27, 2012
Noncontrolling Interest [Line Items]      
Redeemable Interests $ 851.6   $ 847.8
Noncontrolling interests 448.0   461.0
Distributions To Noncontrolling And Redeemable Interest Holders (29.5) 0 5.2
Yoplait Marques SAS [Member]
     
Noncontrolling Interest [Line Items]      
Ownership Percentage in Consolidated Subsidiary   50.00%  
Yoplait SAS [Member]
     
Noncontrolling Interest [Line Items]      
Ownership Percentage in Consolidated Subsidiary   51.00%  
Related Party Transaction, Amounts of Transaction   28.3  
Sodiaal SAS [Member]
     
Noncontrolling Interest [Line Items]      
Redeemable Interests 851.6 904.4  
Redeemable Interest Percent Ownership   49.00%  
Number of Years of Redeemable Interest   9 years  
Related Party Transaction, Amounts of Transaction 61.3    
Noncontrolling interests   263.8  
Distributions To Noncontrolling And Redeemable Interest Holders 28.6    
General Mills Cereals LLC [Member]
     
Noncontrolling Interest [Line Items]      
Noncontrolling Interest Holders Capital Account, General Mills Cereals, LLC $ 251.5    
Preferred Distributions Basis Spread On Variable Rate 1.10%