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Acquisition and Divestitures (Divestitures) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 27, 2016
May 29, 2016
Nov. 29, 2015
May 27, 2018
May 28, 2017
May 29, 2016
Divestitures [Line Items]            
Proceeds from divestitures       $ 0.0 $ 17.5 $ 828.5
Pre-tax gain (loss) on sale of business       0.0 (13.5) $ 148.2
Brand asset retained       $ 6,818.7 $ 4,161.1  
Green Giant Brand [Member] | Regions Excluding North America [Member]            
Divestitures [Line Items]            
Brand asset retained     $ 30.1      
General Mills de Venezuela CA Subsidiary [Member]            
Divestitures [Line Items]            
Pre-tax gain (loss) on sale of business   $ (37.6)        
General Mills Argentina S.A. Foodservice Business [Member]            
Divestitures [Line Items]            
Pre-tax gain (loss) on sale of business   $ (14.8)        
Sale of Martel, Ohio Manufacturing Facility [Member] | Convenience Stores and Foodservice Segment [Member]            
Divestitures [Line Items]            
Proceeds from divestitures $ 17.5          
Pre-tax gain (loss) on sale of business $ (13.5)          
Sale of North American Green Giant Product Lines [Member]            
Divestitures [Line Items]            
Proceeds from divestitures     822.7      
Pre-tax gain (loss) on sale of business     199.1      
Net cash proceeds     $ 788.0