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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
May 27, 2018
May 28, 2017
May 29, 2016
Noncontrolling Interest [Line Items]      
Reclassification from AOCI to retained earnings, stranded income tax effects resulting from the Tax Cuts and Jobs Act of 2017 $ 329.4    
Recognized tax windfall benefits related to the exercise of stock-based awards 25.2    
Reclassification of recognized tax windfall benefits related to the exercise of stock-based awards from financing activities to operating activities 25.2 $ 64.1 $ 94.1
Reclassification of employee tax withholdings on stock-based awards from operating activities to financing activities $ 26.8 $ 37.8 $ 40.3
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Finite-Lived Intangible Assets Useful Life 4 years    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Finite-Lived Intangible Assets Useful Life 30 years    
General Mills [Member] | Yoplait SAS [Member]      
Noncontrolling Interest [Line Items]      
Ownership interest percentage in consolidated subsidiary 51.00%    
Sodiaal International Redeemable Interest [Member] | Yoplait SAS [Member]      
Noncontrolling Interest [Line Items]      
Redeemable interest percentage 49.00%    
Redeemable interest terms Sodiaal has the ability to put all or a portion of its redeemable interest to us at fair value once per year, up to three times before December 2024.    
Building [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment Useful Life 40 years    
Equipment, Furniture and Software [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment Useful Life 3 years    
Equipment, Furniture and Software [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment Useful Life 10 years